A bus started its journey from Mumbai and reached Pune in 30 min with its average speed of 60 km/hr. If the average speed of the bus is increased by 10 km/hr, how much time will it take to cover the same distance?
Choose the correct choice:
A) 28 min 30 sec B) 25 min 42 sec C) 25 min 40 sec D) 25 min 43 sec E) 30 min 00 sec
Sol. Distance between Ramgarh and Devgarh =(60*30/60=30   Average speed of the bus is increased by 10 km/hr then the   speed of the bus = 70km/hr   Required time = 30*60/70= 25min 42sec   25 min 42 sec
<result>B</result>
A bus started its journey from Mumbai and reached Pune in 30 min with its average speed of 60 km/hr. If the average speed of the bus is increased by 10 km/hr, how much time will it take to cover the same distance?