Murali travelled from city A to city B at a speed of 40 kmph and from city B to city C at 60 kmph. What is the average speed of Murali from… — Answer & Discussion

Murali travelled from city A to city B at a speed of 40 kmph and from city B to city C at 60 kmph. What is the average speed of Murali from A to C given that the ratio of distances between A to B and

A48 kmph
B50 kmph
C52 kmph
D56 kmph

Correct answer: B

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Discussion 2

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CCommunity27 Jun 2021

Let the distances between city A to B and B to C be 2x km and 3x km respectively.

Total time taken to cover from A to C

= (2x)/40 + (3x)/60 = (6x + 6x)/120 = 12x/120 = x/10 Average speed = (2x + 3x)/(x/10) = 50 kmph.

CCommunity29 Jun 2021

50 kmph

Let the distances between city A to B and B to C be 2x km and 3x km respectively.

Total time taken to cover from A to C
= (2x)/40 + (3x)/60 = (6x + 6x)/120 = 12x/120 = x/10 Average speed = (2x + 3x)/(x/10) = 50 kmph.