A person can row at 10 kmph and still water. He takes 5 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 2 kmph?
Select:
A) 32 km B) 25 km C) 28 km D) 24 km E) 20 km
Let the distance between A and B be x km.   Total time = x/(10 + 2) + x/(10 - 2) = 5   =&gt; x/12 + x/8 = 5 =&gt; (2x + 3x)/24 = 5 =&gt; x = 24 km.   ANSWER:24 km
<result>D</result>
A person can row at 10 kmph and still water. He takes 5 hours to row from A to B and back. What is the distance between A and B if the speed of the stream is 2 kmph?