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15 votes
15 votes
There are only two busses in Zieglerville, New York. Bus #1 leaves the depot at 10:00 am and returns every 30 minutes. Bus #2 also leaves the depot at 10:00 am and returns every 18 minutes. What time of day would it be the first time both buses returned to the depot together?

User Barry Hamilton
by
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1 Answer

14 votes
14 votes

Explanation:

Find the LCM of the 30 & 18.

30: 2x3x5

18: 2x3x3

LCM: 2x3x3x5 = 90

Add the amount to the 10:00

90 minutes = 1hr 30mins

10:00 + 01:30 = 11:30 am

I'm not sure. :|

User DrRoach
by
3.1k points