A boat can travel with a speed of 40km/hr in still water. If the speed of the stream is 5km/hr, find the time taken by the boat to go 45km downstream.	Select:	A) 1 hr	B) 2 hrs	C) 3 hrs	D) 4 hrs	E) 5 hrs

Rationale: "speed downstream = ( 40 + 5 ) km / hr = 45 km / hr . time taken to travel 45 km downstream = 45 / 45 hrs = 1 hrs . answer : a"
Answer: A