IXL | Find start and end times: multi-step word problems

Bernard is going to make chili for a football party. It will take 50 minutes to prepare all the ingredients and assemble them in the pot. Then, the chili will need to simmer for 1 hour and 55 minutes. What is the latest time Bernard can start preparing the ingredients if the chili needs to be ready at 4:00 P.M.?

6:00 P.M.

5:00 P.M.

1:15 P.M.

2:05 P.M.

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question

Philip's class took a field trip to the art museum. It took them 35 minutes to drive to the museum. They stayed at the museum for 3 hours and 40 minutes. When the class left the museum, it was 2:20 P.M. What time did Philip's class leave for the field trip?

10:05 A.M.

10:40 A.M.

1:20 P.M.

2:15 P.M.

solution

Add the times to find the total elapsed time.

35 min + 3 h 40 min = 4 h 15 min

Now find 4 hours and 15 minutes before 2:20 P.M.

Count back by hours to find

4 hours

before 2:20 P.M. This is

10:20 A.M.

Now subtract

15 minutes

from

10:20 A.M.

This is 10:05 A.M.

Philip's class left at 10:05 A.M.

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Lesson: Elapsed time

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