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?

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

:)

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?

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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?