A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 45km/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	Pick one.
A) 8.95km/hr
B) 26.7km/hr
C) 27.7km/hr
D) 37.9km/hr
E) 8.45km/hr
average speed = (2*45*20)/45+20 km/hr   =27.7 km/hr   Answer (27.7km/hr)
<result>C</result>
A car driver travels from the plains to the hill station, which are 200 km apart at an average speed of 45km/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