In covering a distance of 30 km, Abhay takes 2 hours more than Sameer. If Abhay doubles his speed, then he would take 1 hour less than Sameer. Abhay's speed is:

A. 5 kmph

B. 6 kmph

C. 6.25 kmph

D. 7.5 kmph

Correct Answer :

A. 5 kmph

Let Abhay's speed be x km/hr. $Then,\frac{30}{x}-\frac{30}{2x}=3$ $\Rightarrow 6x=30$ $\Rightarrow x=5km/hr.$