A motorist travels to a place 150 km away at an average speed of 50 km/hr and returns at 30 km/hr. His average speed for the whole journey in km/hr is
Answer: (1) 37.5
The average speed = 2XY/(X + Y) km/hr.
Where, X – first speed & Y – Second speed.
The average speed = 2 x 50 x 30/(50 + 30)
= 37.5 km/hr.
Hence, the answer is (1) 37.5