In covering a distance of 42 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 one:	A) 5 km/h	B) 7 km/h	C) 10 km/h	D) 15 km/h	E) 25 km/h
Let A's speed be X km/hr.   Then, 42/x - 42/2x = 3   6x = 42   x = 7 km/hr.   Answer : 7 km/h.
<result>B</result>
In covering a distance of 42 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: