A man can row a boat at 20 kmph in still water. If the speed of the stream is 8 kmph, what is the time taken to row a distance of 60 km downstream?
Choices.
A) 30/18 hours	B) 15/7 hours	C) 80/13 hours	D) 30/13 hours	E) 30/43 hours
Speed downstream = 20 + 8= 
<gadget id="calculator">20 + 8</gadget>
<output>28</output>
28 kmph.   Time required to cover 60 km downstream= d/s = 60/28   = 15/7 hours.   Answer: 15/7 hours
<result>B</result>
A man can row a boat at 20 kmph in still water. If the speed of the stream is 8 kmph, what is the time taken to row a distance of 60 km downstream?