One bus leaves a stop every 9 minutes. A second bus leaves the stop every 15 minute. If they both leave at 1:25pm what time wll they leave together

Question

need help please

Answer 1

9 = 3², 15 = 3 · 5

The least common multiple (LCM) of 9 and 15 is 45.

 

The next time they both leave at the same time is 45 minutes after 1:25, or 2:10.