Chapter 4.3A, Problem 15A

In Quinn’s dormitory room, there are three snooze-alarm clocks, each of which is set at a different time. Clock A goes off every 15 min, clock B goes off every 40 min and clock C goes off every 60 min. If all three clocks go off at 6:00 A.M., answer the following questions.

a. How long will it be before the clocks go off simultaneously again after 6:00 A.M.?

b. Would the answer to (a) be different if clock B went off every 15 min and clock A went off every 40 min?