A is twice as fast as B and B is thrice as fast as C is. The journey covered by C in hours will be covered by A in :
[A]15 minutes
[B]20 minutes
[C]30 minutes
[D]1 hour
15 minutes
Let speed of B = x km/hr
Speed of A = 2x km/hr
Speed of C
∴ Required Time
Hence option [A] is correct answer.