A boat can travel with a speed of 16 km/hr in still water. If the speed of the stream is 4 km/hr, find the time taken by the boat to go 60 km downstream.	Pick.
A) 2 hours .	B) 3 hours .	C) 4 hours .	D) 5 hours .	E) 6 hours .

Rationale: "speed downstream = ( 16 + 4 ) km / hr = 20 km / hr . time taken to travel 60 km downstream = 60 / 20 = 3 hours . answer : b"
Answer: B