Excluding stoppages, the speed of the bus is 54 kms /hr and with stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?  Choose the correct choice from the following options
A) 9 B) 10 C) 11 D) 12 E) 20
By including stoppages, bus will cover 9km less..(54km -45km = 9km)   Excluding stoppages, x = 54 kmph   Including stoppages, y = 45 kmph   Difference, z = 9km   Time taken to cover that 9km(bus stops per hour(60minutes))= z/x(60minutes)   = 9/54(60)   = 1/6(60)   = 10minutes.   ANSWER:10
<result>B</result>
Excluding stoppages, the speed of the bus is 54 kms /hr and with stoppages, it is 45 kmph. For how many minutes does the bus stop per hour?