Question

There are 3 buses in the park. The first

bus takes 2 hours to make a round trip,
the next bus takes 4 hours and the
third bus takes 5 hours. If they all
leave the park at the same time, how
many hours later will they all arrive
back in the park, at the same time?

Answer 1

20 hours later.

Explanation:

If all three buses leave at the same time, they will arrive back in the park in 20 hours. If we want them to arrive at the exact same time, we need to find the least common multiple of all the numbers because the time it takes to get back into the park are different and without using least common multiple they would all arrive at different times. So, the least common multiple is 20 becuase they all have 20 as a multiple. In 20 hours all of the buses will arive back in the park at the same time.

Hope this helps

:)

Answer 2

I believe the answer is H=20