A boat can travel with a speed of 14 km/hr in still water. If the speed of the stream is 6 km/hr, find the time taken by the boat to go 72 km downstream.  Choose the correct choice
A) 4.25 hr	B) 3.6 hr	C) 8.25 hr	D) 2.25 hr	E) 2.50 hr

Rationale: "speed of boat in still water = 14 km / hr speed of the stream = 6 km / hr speed downstream = ( 14 + 6 ) = 20 km / hr time taken to travel 72 km downstream = 72 â  „ 20 = 3.6 hours answer is b"
Answer: B