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.