Question : Excluding stoppages, the speed of a bus is 60 kmph and including stoppages, it is 54 kmph. For how many minutes does the bus stop per hour?
Option 1: 4 mins
Option 2: 6 mins
Option 3: 7 mins
Option 4: 5 mins
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Correct Answer: 6 mins
Solution :
Given,
Excluding stoppages, the speed of a bus is 60 kmph.
Including stoppages, it is 54 kmph.
The average speed (including stoppages) = 45 kmph
We know, Distance = speed × time taken
So in 1 hr, distance travelled = 54 km
The average speed (excluding stoppages) = 60 kmph
At this speed, time is taken by bus to travel 45 km = $\frac{54}{60}=\frac{9}{10}$ hours = 54 minutes
So at a speed of 60 km/hr, the bus can travel a distance of 54 km every 54 minutes.
For every hr, the bus stops for = 60 – 54 = 6 minutes
Hence, the correct answer is 6 mins.
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