Question

Three bus services A, B and C arrive at a station. Service A arrives at the station every 15 minutes, service B arrives every 20 minutes and service C arrives every 30 minutes. All three buses arrive at the station together at 9 a.m. At what time will the three buses next arrive at the station

Answer 1

Answer:

The three buses will next arrive the station at 11 am

Step-by-step explanation:

Just take the L.C.M of 15,20,30 it is 120.

So after 120 minutes= 2hours the buses will meet together

Answer 2

Answer:

10AM

Step-by-step explanation:

Basically what here asked is the LCM of 15,20,30

which is,

15 = 3*5

20 = 2²*5

30 = 2*3*5

LCM - 2²*3*5 = 60

so all the bus will arrive arrive after 60 minutes,

which means at 10AM.

I hope your doubt will be clear now.

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