In covering a distance of 120 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:	Select:
A) 5 km/h	B) 8 km/h	C) 10 km/h	D) 15 km/h	E) 20 km/h
Let A's speed be X km/hr.   Then, 120/x - 120/2x = 3   6x = 120   x = 20 km/hr.   Answer : 20 km/h.
<result>E</result>
In covering a distance of 120 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: