Excluding stoppages, the speed of a bus is 5454 kmph and including stoppages, it is 4545kmph. For how many minutes does the bus stop per hour?  Select the correct option:
A) 12 B) 11 C) 10 D) 9 E) 8

Rationale: "explanation : speed of the bus excluding stoppages = 54 = 54 kmph speed of the bus including stoppages = 45 = 45 kmph loss in speed when including stoppages = 54 â ˆ ’ 45 = 9 kmph = 54 â ˆ ’ 45 = 9 kmph â ‡ ’ â ‡ ’ in 11 hour , bus covers 99 km less due to stoppages . hence , time in which the bus stops per hour = time taken to cover 99 km = distancespeed = 954 hour = 16 hour = distancespeed = 954 hour = 16 hour = 606 min = 10 min answer is c"
Answer: C