A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30 km/hr. His average speed for the whole journey in km/hr is  Choose the correct choice from the following choices:
A) 35
B) 37
C) 37.5
D) 40
E) 42
Solution   Average Speed	= (2xy/x +y )km/hr   =(2x50 x30/ 50+30)   = 37.5 km/hr.   Answer 37.5
<result>C</result>
A motorist travel to a place 150 km away at an avearge speed of 50 km/hr and returns ar 30 km/hr. His average speed for the whole journey in km/hr is