Question
A is twice as fast as B and B is thrice as fast as C is. The journey covered by C in 54 minutes will be covered by B in :
Answer: Option A
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Let C's speed = `x` km/hr, Then , B's speed = 3`x` km/hr and A's speed = 6`x` km/hr
`:.` Ratio of speed of A, B, C = `6x : 3x : x` = 6 : 3 : 1
Ratio of time taken = `1/6 : 1/3 : 1 `= 1 : 3 : 6
If C takes 6 min., then B takes 2 min.
If C takes 54 min, then B takes `(2/6 xx 54)` min = 18 min.
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