Elapsed time: find the start time or the duration
Work backward from an end time to find the start time, or find how long an event lasted given its start and end times. Unlimited questions, five difficulty levels, and a full worked solution every time — free.
Try one
A class field trip lasts 60 minutes and ends at 11:45 a.m.. What time did it start?
Answer: 10:45 a.m.
See one solved, step by step
A library visit starts at 9:20 a.m. and ends at 10:35 a.m.. How long did it last?
📘 Worked solution
1From 9:20 a.m. to 10:35 a.m.Count forward from the start time to the end time.
21 hour(s) and 15 minute(s) pass.Break the elapsed time into whole hours plus leftover minutes.
3Total elapsed time: 75 minutesConvert the hours to minutes (1 * 60 = 60) and add the leftover 15 minutes.
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