Grades 7-8 Video Solutions 2026-2026_7-8

Video Transcription

Video Summary

Two watches were set correctly at 9 PM. The grandfather’s watch loses 5 minutes per real hour, so it advances 55 watch minutes each real hour. If it shows 8 AM the next morning, that is 11 watch hours later, meaning 12 real hours passed, so the real time is 9 AM. The father’s watch gains 5 minutes per real hour, so it advances 65 watch minutes each real hour. In 12 real hours, it moves ahead 780 watch minutes, or 13 watch hours. Starting from 9 PM, that makes it show 10 AM. So the answer is 10 AM.

Keywords

watch time

time calculation

grandfather watch

father watch

clock drift