A man with his bike travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is	Select
A) 35 B) 37 C) 37.5 D) 40 E) 39
Explanation :   Average speed = 2xy/(x + y) km/hr   = 2*50*30/(50 + 30)= 
<gadget id="calculator">2*50*30/(50 + 30)</gadget>
<output>75/2 = around 37.5</output>
37.5 km/hr   Answer : 37.5
<result>C</result>
A man with his bike travels to a place 150 km away at an average speed of 50 km per hour and returns at 30 km per hour. His average speed for the whole journey in km per hour is