A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 30km/hr. in return trip, he covers the same distance at an average speed of 20km/hr. the average speed of the car over the entire distance of 400 km is	Choose the correct choice from the following answers:	A) 8.95km/hr	B) 24.0km/hr	C) 27.8km/hr	D) 37.9km/hr	E) 8.45km/hr
average speed = (2*30*20)/30+20 km/hr   =24 km/hr   Answer (24.0km/hr)
<result>B</result>
A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 30km/hr. in return trip, he covers the same distance at an average speed of 20km/hr. the average speed of the car over the entire distance of 400 km is