Question

Bus A and Bus B leave the bus depot at 9 am. Bus A takes 30 minutes to do its route and bus B takes 40 minutes to complete its route. At what time are they both back at the bus depot together? Give your answer as a 12-hour clock time.

Answer 1

in this question, we must find the LCM

10 |_  30, 40

3   |_ 3, 4

4   |_ 1, 4

    |_ 1, 1

So, LCM of 30 and 40 = 10 x 3 x 4 = 120

After 120 minutes

9+2 = 11 am they will be at the same depot

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