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 km/hr

B. 6 km/hr

C. 6.25 km/hr

D. 7.5 km/hr

Answer: Option A

Solution(By Examveda Team)

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