A is twice as fast as B and B is thrice as fast as C is the journey covered by C in 1½ hours will be covered by A in
Explanation:
According to question, A : B : C 2 : 1 : 3 : 1 A : B : C 6 : 3 : 1 →Ratio of speed 1/6 : 1/3 : 1/1 →Ratio of Time
Since, time ∝ 1/speed
⇒ 1 : 2 : 6 ↓ 1/4 3/2
∴ Time taken by A = 1 × 1/4 = 15 minutes
Hence, option (a).
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