# Can you calculate the time A takes in the same journey that C covered in 42 min ?

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A is twice as fast as B and B is thrice as fast as C is.
Can you calculate the time A takes in the same journey that C covered in 42 min ?

posted Dec 4, 2014

+1 vote

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 (1/6 * 42) min = 7 min

Ans: 7 mins...
Speed is inversely proportional to time

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