In covering a distance of 36 km, A takes 2 hours more than B. If A doubles his speed, then he would take 1 hour less than B. A's speed is:
Choose the correct choice from the following options:
A) 5 km/h  B) 6 km/h  C) 10 km/h  D) 15 km/h  E) 25 km/h
Let A's speed be X km/hr.   Then, 36/x - 36/2x = 3   6x = 36   x = 6 km/hr.   Answer : 6 km/h.
<result>B</result>
In covering a distance of 36 km, A takes 2 hours more than B. If A doubles his speed, then he would take 1 hour less than B. A's speed is: