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Question

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

A
14 min 25 sec
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B
7 min
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C
28 min 37 sec
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D
54 min 35 sec
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Solution

The correct option is B 7 min
Let C's speed = x km/h
B's speed = 3x km/h
A's speed=6x km/h
There fore Ratio of speed of ABC = 6x : x= 6 : 3 : 1
Ratio of times taken = 16:13:1=1:2:6
If C takes 42 min , A takes 1 min.
If C takes 42 min. A takes (16×42)=7minutes

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