NCHMCT JEE 2013 Question Paper with solutions for online practice

Question : 92 of 200

Marks: +1, -0

A man travels a certain distance at the rate of 10 km/hr and returns the same point at rate of 15 km/hr. His average rate for the whole journey is:

Solution:

Average speed =

{2ab}/{a+b}

{2×10×15}/{1015}

{2×10×15}/{25}

= 12 km/hr

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