Correct Answer - Option 4 : 12 min
Given:
Speed of bus excluding stoppage = 70 km/hr
Speed of bus including stoppage = 56 km/hr
Formula used:
Speed = distance/time
Calculation:
Loss in speed when including stoppage = 70 - 56 = 14 km/hr
In 1 hour, bus covers 14 km less due to stoppage
Hence,
Time in which the bus stop per hour = Time taken to cover 14 km.
Time = Distance/speed
⇒ Time = 14/70
⇒ Time = 1/5 hour
⇒ Time = (1/5) × 60 minutes = 12 minutes
∴ 12 minutes the bus stop per hour.
