Question : After excluding stoppages, the speed of the bus is 60 km/hr and after including stoppages, it is 45 km/hr. For how many minutes does the bus stop per hour?
Option 1: 10
Option 2: 9
Option 3: 12
Option 4: 15
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Correct Answer: 15
Solution :
The average speed (including stoppages) = 45 km/hr
Distance = Speed × Time taken
So in 1 hour, distance travelled = 45 km
The average speed (excluding stoppages) = 60 km/hr
At this speed, time is taken by bus to travel 45 km = $\frac{45}{60}=\frac{3}{4}$ hours = 45 minutes
So at a speed of 60 km/hr, the bus can travel a distance of 45 km every 45 minutes.
⇒ For every hour the bus stops for (60 – 45) = 15 minutes
Hence, the correct answer is 15.
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