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Amar is twice as fast as Rohit and Rohit is thrice as fast as Chanda is. The journey covered by Chanda in 42 minutes will be covered by Amar in - Mathematics

MCQ

Amar is twice as fast as Rohit and Rohit is thrice as fast as Chanda is. The journey covered by Chanda in 42 minutes will be covered by Amar in

Options

  • 14 min 25 sec

  • 7 min

  • 28 min 37 sec

  • 54 min 35 sec

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Solution

7 min

Explanation:

Let C's speed = x km/h

B's speed = 3x km/h

A's speed = 6x km/h

Therefore Ratio of speed of ABC = 6x : 3x : x = 6 : 3 :1

The ratio of times taken`=1/6:1/3:1=1:2:6`

If C takes 6 min, A takes 1 min.

If C takes 42 min. A then A takes`(1/6xx42)`=7 minutes.

Concept: Time, Distance and Speed(Entrance Exam)
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