Question

A is twice as fast as B and B is thrice as fast as C. The journey covered by C in 42 minutes will be covered by A in

• A. 7 minutes
• B. 14 minutes
• C. 28 minutes
• D. 63 minutes

Answer 1

Answer: (A)

7 minutes

Let C's speed be x metres/min

Let time taken by A be y min.

Then, B's speed = 3x metres/min

And, A's speed = 6x metres/min

Ratio of speed of A and C = Ratio of time taken by C and A

$6x:x=42:y$

$\frac{6x}{x}=\frac{42}{y}$

$y=7$ $min$