At track practice, Tim practiced running the hurdles for 50 minutes. Then he practiced the high jump for 1 hour and 20 minutes. If Tim's track practice ended at 12:55 P.M., what time did it start?
Question
At track practice, Tim practiced running the hurdles for 50 minutes. Then he practiced the high jump for 1 hour and 20 minutes. If Tim's track practice ended at 12:55 P.M., what time did it start?
Solution
First, we need to convert all the time to the same unit. In this case, we'll use minutes. We know that 1 hour is equal to 60 minutes.
Tim practiced the high jump for 1 hour and 20 minutes. Converting that to minutes gives us 60 minutes (for the hour) + 20 minutes = 80 minutes.
So, in total, Tim practiced for 50 minutes (hurdles) + 80 minutes (high jump) = 130 minutes.
We know that there are 60 minutes in an hour. So, 130 minutes is equal to 2 hours and 10 minutes (120 minutes for the 2 hours and the remaining 10 minutes).
If Tim's practice ended at 12:55 P.M., we need to subtract the total time he practiced from this end time to find the start time.
Subtracting 2 hours from 12:55 P.M. gives us 10:55 A.M. Then, subtracting the remaining 10 minutes from 10:55 A.M. gives us 10:45 A.M.
So, Tim's track practice started at 10:45 A.M.
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