Just subtract the initial time for the last time.

Teachers should first understand: don't treat students as ignorant. In fact, students know everything in their hearts. It's no different from your heart. So the purpose of teaching is to let students find what they already have in their hearts.

One hour equals sixty minutes. 1000 minutes divided by 60 is approximately equal to 16.67. Minutes and seconds: 1, and hours are time units. The hour is not the basic unit of the international system of time units (the basic unit of the international system of time units is seconds), but an auxiliary unit of time coordinated with the basic unit of the international system of units.