Solve. A clock loses 2 minutes every 8 hours. Avirupa’s mom plans to set the alarm at 11 p.m. on Sunday night to get Avirupa up each morning. Avirupa has to get up each day no later than 7 a.m. What time should her mom set the alarm to be sure that Avirupa isn’t late to school any day, Monday through Friday?
See here. There are13 eight-hour intervals between 11 p.m., Sunday and 7 a.m., Friday.
Total loss = 13 × 2 = 26 minutes.
7:00 a.m. − 0:26 minutes = 6:34 a.m.
The alarm needs to be set for 6:34 a.m. to be sure that Avirupa gets up by 7 a.m. on Friday.