Including stoppages the speed of a bus is 60 km/hr and excluding stoppages its speed is 65 km/hr. For how long the bus stops in an hour?
Answer & explanation
Correct answer: option 3
Without stoppage speed = 65 Km/hr
It means, the bus goes:
65 km in = 60 min
01 km in = \(\frac{60}{65}\) min
05 km in = \(\frac{60}{65}\) × 05 min = 4.6 min (approx) ....(i)
Now,
With stoppage, speed of bus = 60 Km/hr
The bus goes 60 km in = 60 min.
It means, the bus cannot travels 5 km due to stoppage and it can go 05 km in 4.6 min as eq.-(i)
Therefore, the bus stops for 4.6 min or 4 min (as per option) in one hour.