A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 55km/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  Choices
A) 8.95km/hr  B) 26.7km/hr  C) 27.8km/hr  D) 29.3km/hr  E) 8.45km/hr
average speed = (2*55*20)/55+20 km/hr   =29.3 km/hr   Answer (29.3km/hr)
<result>D</result>
A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 55km/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