Question

Hugo likes to sit on certain park bench. He has sat there so often he knows that a red tour bus passes by every 4 minutes and a blue tour bus passes by every 9 minutes.

Hugo saw both buses pass by at the same time at 9:05 a.m. When is the next time both buses will pass by at the same time?

Answer 1

the red tour bud will pas again at 9:09
and the blue tour bus will pass again at 9:14