Find His Average Speed For The Whole Journey In km/hr

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

  1. 37.5
  2. 37
  3. 35
  4. 40
Anurag Mishra Professor Asked on 21st July 2015 in Maths.
Add Comment
1 Answer(s)

Answer: (1) 37.5
Explanation:-
Formula-
The average speed = 2XY/(X + Y) km/hr.
Where, X – first speed  & Y – Second speed.
Then,
The average speed  = 2 x 50 x 30/(50 + 30)
= 3000/80
= 37.5 km/hr.
Hence, the answer is (1) 37.5

Anurag Mishra Professor Answered on 22nd July 2015.
Add Comment

Your Answer

By posting your answer, you agree to the privacy policy and terms of service.