In covering a distance of 42 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:  Choose the correct choice from the following options:
A) 5 kmph
B) 6 kmph
C) 6.25 kmph
D) 7 kmph
E) 7.8 kmph

Rationale: "let abhay ' s speed be x km / hr . then , 42 / x - 42 / 2 x = 3 6 x = 42 x = 7 km / hr . answer : option d"
Answer: D