Buses

At the bus stop is at 10 o'clock met buses No. 2 and No. 9. Bus number 2 runs at an interval of 4 minutes and the bus number 9 at intervals of 9 minutes. How many times the bus meet to 18:00 local time?

Correct result:

n =  13

Solution:

4=22 9=33  LCM(4,9)=36  t=(1810)60=480 min n=t/36=480/36=13.3313



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