There are 10 minutes until the next hour of 08:00 and there are 23 minutes from 11:00 until 11:23. “The bus leaves the station at 07:50 and arrives at its destination at 11:23. Here is another word problem involving calculating elapsed time. The total minutes spent on the homework is 30 + 13, which equals 43 minutes. There are 30 minutes from the start time of 18:30 to the next hour and there are 13 minutes from 19:00 until 19:13. Count the hours in between.įor example, “I start my homework at 18:30 and finish it at 19:13. Find the minutes from the start time to the next hour and from the final hour until the finish time. Write these times at each end of a number line. To solve word problems with elapsed time, identify the start and finish times. Here are some elapsed time worded problems. In total, the elapsed time is 53 minutes. Count the number of whole hours in between.įor example, use a number line to find the elapsed time between 10:50 and 11:43.įirst count on 10 minutes to get to 11:00 and then count on 43 minutes to get to 11:43. Work out the minutes from the start time to the first hour and add this to the number of minutes from the last hour until the finish time. Write all of the hours in between these times on the number line. To work out elapsed time on a number line, write the start time on the left of the line and the finish time on the right of the line. The elapsed time is 4 hours and 30 minutes. Looking at the hours, 16 – 12 = 4 and looking at the minutes, 40 – 10 = 30. For example to calculate the elapsed time between 12:10 and 16:40, subtract 12:10 from 16:4. Subtract the minutes and hours separately. The formula for calculating elapsed time is elapsed time = end time – start time. If this is not the case, negative numbers will arise if a larger number is subtracted from a smaller number. The elapsed time can be calculated by direct subtraction only if the number of minutes in the final time is greater than the number of minutes in the start time. The elapsed time is 13 hours and 35 minutes. For example, between 10:22 and 23:57, we subtract the hours: 23 – 10 = 13. Subtract the hours and minutes separately. If the number of minutes in the final time is larger than the number of minutes in the start time, the elapsed time can be calculated by subtracting the start time from the final time. Here is a set of examples of calculating the elapsed time between two given times. Adding the hours and minutes separately, the total elapsed time is 1 hour 15 minutes. Then count the 15 minutes from 10:00 to 10:15. Then count the 1 hour from 09:00 until 10:00. First count 40 minutes from 08:20 until the next hour of 09:00. The elapsed time is 3 hours and 26 minutes.įor example, calculate the elapsed time between 08:20 and 10:15. The final step is to add the hours and minutes to find a total. Simply read off the minutes from the final time. From 15:00 until 15:11, there are 11 minutes. The third step is to count the number of minutes from this hour until the final time. From 12:00 until 15:00, there are 3 hours. The second step is to count on in hours until the hour immediately before the final time. The first time is 11:45 and the hour that comes after it is 12:00.Įach hour has 60 minutes and so, to work out the number of minutes between 11:45 and 12:00, subtract 45 from 60. The first step is to count the number of minutes from the first time to the hour that comes after it.
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