A person can row at 9 kmph and still water. He takes 6 1/2 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? Choices:	A) 32	B) 28	C) 29	D) 54	E) 20
Let the distance between A and B be x km.   Total time = x/(9 + 1) + x/(9 - 1) = 6.5   =&gt; x/10 + x/8 = 13/2 =&gt; (4x + 5x)/40 = 13/2 =&gt; x   = 29 km.   Answer:29
<result>C</result>
A person can row at 9 kmph and still water. He takes 6 1/2 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?