Without any stoppage a person travels a certain distance at an average speed of 50 km hr and with st...........

Quantitative Aptitude ( CCS) Time & distance

Without any stoppage a person travels a certain distance at an average speed of 50 km/hr and with stoppages he covers the same distance at an average speed of 40 km/hr. How many minutes per hour does he stop?

20min

18min

24min

15min

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Explanation:

Solution:
Let the total distance be x km.
Time taken at the speed of 50 km/hr = x/50 hrs.
Time taken at the speed of 40 km/hr = x/40 hrs.
He rested for ( x/40 – x/50) hrs = = x/200 hrs.
His rest per hour = x/200 / x/60 = 3/10 hrs. = 18 minutes.