A boat can travel with a speed of 15 km/hr in still water. If the speed of the stream is 5 km/hr. find the time taken by the boat to go 68 km downstream? Pick.
A) 2 hours
B) 3 hours
C) 4 hours
D) 3 hours 24 minutes
E) None
Solution   Speed Downstream	= (15 + 5) km/hr   = 20 km/hr.   Time taken to travel 68 km downstream	=(68 / 20)hrs   = 3 hrs 24 minutes.   Answer 3 hours 24 minutes
<result>D</result>
A boat can travel with a speed of 15 km/hr in still water. If the speed of the stream is 5 km/hr. find the time taken by the boat to go 68 km downstream?