A boat can travel with a speed of 13 km/hr in still water. If the speed of the stream is 6 km/hr, find the time taken by the boat to go 69 km downstream. Choices.
A) 3.6 hr  B) 5.25 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 = 6 km / hr speed downstream = ( 13 + 6 ) = 19 km / hr time taken to travel 69 km downstream = 69 â  „ 19 = 17 â  „ 4 = 3.6 hours answer is a"
Answer: A