Elapsed Time

Show your work for each problem.

1.
A movie started at 3:00 PM and ended at 5:00 PM. How long was the movie?
1. a)1 hour
2. b)5 hours
3. c)3 hours
4. d)2 hours
Answer: 2 hours
From 3:00 PM to 5:00 PM is 2 hours. Count: 3 to 4 is 1 hour, 4 to 5 is another hour. Total: 2 hours.
2.
Lunch started at 12:00 PM and ended at 12:30 PM. How many minutes long was lunch?
Answer: 30
From 12:00 PM to 12:30 PM, the hour stays the same. We just count the minutes: minutes.
3.
School starts at 8:00 AM and ends at 3:00 PM. How long is the school day?
1. a)8 hours
2. b)6 hours
3. c)7 hours
4. d)5 hours
Answer: 7 hours
From 8 AM to 12 PM is 4 hours. From 12 PM to 3 PM is 3 hours. Total: hours.
4.
Sarah started her homework at 4:15 PM and finished at 5:00 PM. How long did she work on homework?
Answer: 45 minutes
1. What is the start time? 4:15 PM
2. What is the end time? 5:00 PM
3. How many minutes from :15 to :00 of the next hour? 45
5.
A bus left at 9:20 AM and arrived at 10:05 AM. How many minutes was the trip?
Answer: 45
From 9:20 AM to 10:00 AM is 40 minutes. From 10:00 AM to 10:05 AM is 5 minutes. Total: minutes.
6.
A concert started at 7:30 PM and lasted 2 hours and 15 minutes. What time did it end?
1. a)9:15 PM
2. b)9:30 PM
3. c)10:00 PM
4. d)9:45 PM
Answer: 9:45 PM
7:30 PM + 2 hours = 9:30 PM. Then 9:30 PM + 15 minutes = 9:45 PM. The concert ended at 9:45 PM.
7.
Emma left home at 8:45 AM and arrived at school at 9:20 AM. How long was her walk to school?
Answer: 35 minutes
1. From 8:45 AM to 9:00 AM is how many minutes? 15
2. From 9:00 AM to 9:20 AM is how many minutes? 20
3. What is the total time? (15 + 20) 35
8.
A basketball game started at 6:45 PM and ended at 8:30 PM. How many minutes long was the game?
Answer: 105
From 6:45 PM to 8:45 PM is 2 hours = 120 minutes. But we end at 8:30, which is 15 minutes earlier. So minutes, or 1 hour 45 minutes.
9.
Cooking class starts at 10:30 AM. The recipe takes 1 hour and 45 minutes. What time will the dish be ready?
Answer: 12:15 PM
1. Add 1 hour to 10:30 AM. What time is it? 11:30 AM
2. Now add 45 minutes to 11:30 AM. What time is it? 12:15 PM
10.
The train arrived at 4:50 PM. The journey took 1 hour and 25 minutes. What time did the train depart?
1. a)3:25 PM
2. b)3:35 PM
3. c)3:45 PM
4. d)3:15 PM
Answer: 3:25 PM
4:50 PM - 1 hour = 3:50 PM. Then 3:50 PM - 25 minutes = 3:25 PM. The train departed at 3:25 PM.
11.
A flight departed at 11:40 AM and arrived at 3:15 PM. How long was the flight?
Answer: 3 hours 35 minutes
1. From 11:40 AM to 12:00 PM is how many minutes? 20
2. From 12:00 PM to 3:00 PM is how many hours? 3
3. From 3:00 PM to 3:15 PM is how many minutes? 15
4. Total time: how many hours and minutes? 3 hours 35 minutes
12.
A party started at 6:50 PM and ended at 10:25 PM. How many minutes was the party?
Answer: 215
From 6:50 PM to 10:50 PM is 4 hours. From 10:50 PM to 10:25 PM means we went 25 minutes too far, so subtract 25. Total: 4 hours - 25 min = 3 hours 35 min = minutes.
13.
Jake needs to be at soccer practice at 4:30 PM. It takes him 45 minutes to walk there. He wants to eat a snack that takes 20 minutes before leaving. What is the latest time he can start eating?
1. a)3:45 PM
2. b)3:15 PM
3. c)3:25 PM
4. d)3:00 PM
Answer: 3:25 PM
4:30 PM - 45 min (walk) = 3:45 PM (latest time to leave). 3:45 PM - 20 min (snack) = 3:25 PM. Jake must start eating by 3:25 PM.
14.
A movie is 2 hours and 25 minutes long. If it ends at 9:45 PM, what time did it start?
Answer: 7:20 PM
1. Subtract 2 hours from 9:45 PM. What time is it? 7:45 PM
2. Now subtract 25 minutes from 7:45 PM. What time is it? 7:20 PM
15.
Grandma's flight lands at 2:35 PM. She then waits 50 minutes for her luggage and takes a 1 hour 15 minute taxi ride home. What time does she arrive home?
Answer: 4:40 PM
2:35 PM + 50 min (luggage) = 3:25 PM. Then 3:25 PM + 1 hour 15 min (taxi) = 4:40 PM. Grandma arrives home at 4:40 PM.