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Question

A is twice a fast as B and B is thrice as C's. The journey covered by C in 42 minutes, will be covered by A.

A
14 minutes
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B
7 minutes
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C
28 minutes
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D
54 minutes
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Solution

The correct option is B 7 minutes
Let C's speed=x kmph
B's speed=3x kmph
& A's speed=6x kmph
therefore Ratio of speeds of A, B, C=6x:3x:x=6:3:1
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 takes (1/642)min=7min Ans.

1150384_699621_ans_c012dad5147a497db49eeb0848fe5c3f.jpg

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