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 then Sameer. Abhay's speed (in km/hr) is :

Answer: Option A

In these type of questions go through options to save your valuable time :
Option (A)
Abhay's speed = 5 km/hr
Abhay's time = $$\frac{30}{5}$$ = 6 hr
Sameer's time = 6 - 2 = 4 hr
Abhay's new time :
= $$\frac{30}{5\times 2}$$
= 3 hr
Hence option (A) is correct as it satisfies all the conditions.