The speed of a bus is 54 kmph while there is no stoppage and it is 45 kmph while it include the stoppage. So for how many minutes does the bus stop per hour?

A) 20 min

B) 30 min

C) 10 min

D) 40 min

So the difference is (54 - 45) = 9 km

it covers 9 km less with stoppage

So cover time of 9 km is (9*60/54)

= 10 min

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