John can row at 5 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 1 kmph?  Answers.
A) 28 km	B) 12 km	C) 16 km	D) 30 km	E) 20 km
Let the distance between A and B be x km.   Total time = x/(5 + 1) + x/(5 - 1) = 5   =&gt; x/6 + x/4 = 4 =&gt; (2x + 3x)/12 = 5 =&gt; x = 12 km.   ANSWER:12 km
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John can row at 5 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 1 kmph?