Correct Answer - Option 3 : 10 minutes
Given:
Speed of bus excluding stoppage = 54 km/hr
Speed of bus including stoppage = 45 km/hr
Formula used:
Speed = distance/time
Calculation:
Loss in speed when including stoppage = 54 - 45 = 9 km/hr
In 1 hour, bus covers 9 km less due to stoppage
Hence,
Time in which the bus stop per hour = Time taken to cover 9 km.
Time = Distance/speed
⇒ Time = 9/54
⇒ Time = 1/6 hour
⇒ Time = (1/6) × 60 minutes = 10 minutes
∴ 10 minutes the bus stop per hour
