Time Word Problems (Grade 4)
Time word problems require you to apply what you know about reading clocks, elapsed time, and time conversions to real-life situations — travel schedules, school timetables, cooking durations, and more.
In Class 4, you will solve a variety of time word problems involving addition, subtraction, and comparison of time.
What is Time Word Problems - Class 4 Maths (Time)?
Time word problems ask you to find:
- How long something takes (duration).
- When something starts or ends (start/end time).
- Total time spent on multiple activities.
- The difference between two time durations.
Always read the problem carefully to identify what is given and what is asked.
Time Word Problems (Grade 4) Formula
Duration = End Time − Start Time
End Time = Start Time + Duration
Start Time = End Time − Duration
Solved Examples
Example 1: Example 1: School timetable
Problem: Ria's maths class starts at 9:15 AM and ends at 10:00 AM. Her science class starts at 10:05 AM and ends at 10:50 AM. How much time does she spend in both classes combined?
Solution:
Step 1: Maths: 10:00 − 9:15 = 45 minutes.
Step 2: Science: 10:50 − 10:05 = 45 minutes.
Step 3: Total = 45 + 45 = 90 minutes = 1 hour 30 minutes.
Answer: Ria spends 1 hour 30 minutes in both classes.
Example 2: Example 2: Train journey
Problem: A train departs at 6:40 AM and arrives at 11:15 AM. How long is the journey?
Solution:
Step 1: 6:40 → 7:00 = 20 minutes.
Step 2: 7:00 → 11:00 = 4 hours.
Step 3: 11:00 → 11:15 = 15 minutes.
Step 4: Total = 4 hours 35 minutes.
Answer: The journey takes 4 hours 35 minutes.
Example 3: Example 3: Cooking problem
Problem: Meera puts a cake in the oven at 4:25 PM. It needs to bake for 1 hour 10 minutes. When should she take it out?
Solution:
Step 1: 4:25 + 1 hour = 5:25 PM.
Step 2: 5:25 + 10 minutes = 5:35 PM.
Answer: She takes the cake out at 5:35 PM.
Example 4: Example 4: Multiple activities
Problem: Kavi spends 45 minutes on homework, 30 minutes on reading, and 20 minutes on drawing. What is the total time?
Solution:
Step 1: Total = 45 + 30 + 20 = 95 minutes.
Step 2: 95 minutes = 1 hour 35 minutes.
Answer: Kavi spends 1 hour 35 minutes in total.
Example 5: Example 5: Time remaining
Problem: An exam is 2 hours 30 minutes long. Arjun has used 1 hour 50 minutes. How much time is left?
Solution:
Step 1: 2 hr 30 min = 1 hr 90 min (borrow 1 hour).
Step 2: 1 hr 90 min − 1 hr 50 min = 0 hr 40 min.
Answer: 40 minutes are left.
Example 6: Example 6: Auto-rickshaw ride
Problem: Dev takes an auto-rickshaw from home to the market. He leaves at 5:10 PM and reaches at 5:45 PM. On the way back, the traffic is heavier and the ride takes 15 minutes longer. When does he return home?
Solution:
Step 1: Going: 5:45 − 5:10 = 35 minutes.
Step 2: Return ride = 35 + 15 = 50 minutes.
Step 3: If he leaves the market at 5:45 PM, return = 5:45 + 50 min = 6:35 PM.
Answer: Dev returns home at 6:35 PM.
Example 7: Example 7: Bus schedule
Problem: Buses leave every 20 minutes starting from 8:00 AM. Priya arrives at the bus stop at 8:35 AM. When is the next bus?
Solution:
Step 1: Buses at: 8:00, 8:20, 8:40, 9:00, ...
Step 2: Priya arrives at 8:35. The next bus after 8:35 is 8:40.
Answer: The next bus is at 8:40 AM. She waits 5 minutes.
Example 8: Example 8: Comparing travel times
Problem: Aditi takes 1 hour 25 minutes to go to school by bus. Neha takes 50 minutes by car. How much longer does Aditi's journey take?
Solution:
Step 1: 1 hour 25 min = 85 minutes.
Step 2: 85 − 50 = 35 minutes.
Answer: Aditi's journey takes 35 minutes longer.
Example 9: Example 9: Bedtime calculation
Problem: Rahul goes to sleep at 9:30 PM and wakes up at 6:15 AM. How long does he sleep?
Solution:
Step 1: 9:30 PM to 12:00 midnight = 2 hours 30 minutes.
Step 2: 12:00 midnight to 6:15 AM = 6 hours 15 minutes.
Step 3: Total = 2 hr 30 min + 6 hr 15 min = 8 hours 45 minutes.
Answer: Rahul sleeps for 8 hours 45 minutes.
Key Points to Remember
- Read the problem carefully — identify start time, end time, and duration.
- Use counting-on for elapsed time problems.
- When adding durations, convert to minutes if simpler.
- When crossing noon or midnight, count in parts: AM to 12:00, then 12:00 to PM.
- Always write AM or PM to avoid confusion.
- Check your answer: does it make sense?
Practice Problems
- A movie starts at 3:45 PM and ends at 5:50 PM. How long is the movie?
- Meera starts walking at 6:30 AM and walks for 1 hour 15 minutes. When does she stop?
- Dev spends 50 minutes on maths, 40 minutes on science, and 35 minutes on Hindi. How much time in total? Express in hours and minutes.
- A bus leaves at 7:20 AM and arrives at 9:05 AM. What is the journey time?
- Priya's flight takes off at 10:50 AM. She needs to reach the airport 2 hours early. When should she reach?
- School ends at 3:30 PM. Kavi walks for 25 minutes to reach home. When does he get home?
- A cricket match starts at 2:00 PM and has two sessions of 1 hour 30 minutes each with a 20-minute break. When does it end?
Frequently Asked Questions
Q1. How do I solve time word problems?
First identify what is given (start time, end time, duration) and what is asked. Then use addition (to find end time), subtraction (to find start time or duration), or both.
Q2. What if the problem crosses noon or midnight?
Count in two parts. First count from the start to 12:00, then from 12:00 to the end. Add both parts.
Q3. How do I add durations?
Add the minutes first. If they exceed 60, subtract 60 and add 1 to the hours. Then add the hours.
Q4. How do I subtract time?
Subtract minutes first. If you cannot (e.g., 20 − 45), borrow 1 hour from the hours and add 60 to the minutes, then subtract.
Q5. What does 'how long until' mean?
It asks for the elapsed time from now (or a given time) to a future time. Count forward from the current time to the target time.
Q6. What does 'how long ago' mean?
It asks for the elapsed time from a past event to now. Subtract the past time from the current time.
Q7. How do I handle time problems with breaks?
Add the break time to the total duration. If a match is 2 hours of play plus 30 minutes break, the total event time is 2 hours 30 minutes.
Q8. Should I always convert to minutes?
Not always, but it often makes the calculation easier. Convert to minutes, do the arithmetic, then convert back to hours and minutes.
