Question

Amar is twice as fast as Rohit is thrice as fast as Chanda is.the journey covered by Chanda in 42 minutes will be covered b Amar in

• A. $14$ min $25$ sec
• B. $7$ min
• C. $28$ min $37$ sec
• D. $54$ min $35$ sec

Answer 1

The correct option is B $7$ min

Let C's speed = x km/h
B's speed = 3x km/h
A's speed=6x km/h
There fore Ratio of speed of ABC = 6x : x= 6 : 3 : 1
Ratio of times taken = $\frac{1}{6}:\frac{1}{3}:1=1:2:6$
If C takes 42 min , A takes 1 min.
If C takes 42 min. A takes $(\frac{1}{6}\times 42)=7minutes$