Tell the average speed of the person during whole journey :

A person goes from P to Q with a speed of 50 km/hr and returned back from Q to P with speed of 30 km/hr. Tell the average speed of the person during whole journey.

  1. 37.5 km/hr
  2. 35.5 km/hr
  3. 41.5 km/hr
  4. 38.5 km/hr
Anurag Mishra Professor Asked on 14th December 2015 in Maths.
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2 Answer(s)

Answer: (1) 37.5 km/hr

Solution:- Let the total distance from point P to Q =  X Km.
Then time taken from point P to Q =X/50 hrs
and time taken from point Q to P    =X/30 hrs

Then, Average speed = Total covered distance/ Total taken time
=(X+X)/(X/50+X/30)
=2 X x 150/8 X
=300/8=37.5 Km/hr

Then, average speed of a person is 37.5 km/hr

So,  correct answer is option (1) 37.5 km/hr.

HALCYONJK Newbie Answered on 16th December 2015.
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Answer: (1) 37.5 km/hr 

Anurag Mishra Professor Answered on 12th May 2016.
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