Question

Carlie works at a bakery making bagels and donuts. the oven timer for the donuts buzzes every 30 minutes, and the timer for the bagels buzzes every 40 minutes. if she started both timers at 8:00
a.m., when will the timers buzz at the same time?

Answer 1

This will be the Lowest common multiple of 30 and 40  

which is 120 minutes  so the time when they will buzz together is 8:00 + 120/60  = 10.00 am