A man can row a boat at 18 kmph in still water. If the speed of the stream is 12 kmph, what is the time taken to row a distance of 90 km downstream? Pick one
A) 6 hours  B) 4 hours  C) 3 hours  D) 5 hours  E) 6 hours
Speed downstream = 18 +12= 
<gadget id="calculator">18 +12</gadget>
<output>30</output>
30 kmph.   Time required to cover 90 km downstream= d/s = 90/30= 
<gadget id="calculator">90/30</gadget>
<output>3</output>
3 hours.Answer:3 hours
<result>C</result>
A man can row a boat at 18 kmph in still water. If the speed of the stream is 12 kmph, what is the time taken to row a distance of 90 km downstream?