A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 5 km/hr, find the time taken by the boat to go 70 km downstream.
Answers:
A) 4.25 hr	B) 3.8 hr	C) 8.25 hr	D) 2.25 hr	E) 2.50 hr

Rationale: "speed of boat in still water = 13 km / hr speed of the stream = 5 km / hr speed downstream = ( 13 + 5 ) = 18 km / hr time taken to travel 70 km downstream = 70 â  „ 18 = 3.8 hours answer is b"
Answer: B