Question

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?

Answer 1

Speed of bus without stoppages = 54 km/hr

Speed of bus with stoppages = 45 km/hr

Kilometers lost due to stoppages = 54 - 45 = 9km

54km covered in  1 hour.

 1 km covered in 1/54 hour.

So ,
Time taken to cover 9km   = 9* (1/54) *60 min  
                                                                              (1 hour = 60 min).

90 x 1/54 x 60 = 10 min 

For 10 min , the bus stopped  per hour 

Answer 2

Answer:

Speed of bus without stoppages = 54 km/hr

Speed of bus with stoppages = 45 km/hr

Kilometers lost due to stoppages = 54 - 45 = 9km

54km covered in  1 hour.

 1 km covered in 1/54 hour.

So ,

Time taken to cover 9km   = 9* (1/54) *60 min  

                                                                              (1 hour = 60 min).

90 x 1/54 x 60 = 10 min 

For 10 min , the bus stopped  per hour