[10] Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how m

For Competitive Exams

Excluding stoppages, the speed of a bus is 54 kmph and including stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?

Explanation:
We are given that speed of the Bus with stoppage is 45km/hr. Which means the Bus actually travels 45 km in an hour. This does not mean the bus actually travelled for full 60 minutes, because it is given that the bus had stoppages.

Now the duration in an hour the bus actually travels, the speed of the bus during that duration is 54km/hr.

So lets say the bus actually travels for T minutes in an hour. From the given information we can say

54 * T/60 = 45
T = 45 *60/54 = 50 minutes.

So the duration of the stoppage in 1 hour = 60 - 50 = 10 mins.

Answer is B)10

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