Aman can row 1km upstream in 20 min and back to his starting point in 12 min.How long would he take to row 1km in still water?.  Select the correct option:
A) 12 mins	B) 13 mins	C) 14 mins	D) 15 mins	E) 16 mins
If his speed is x mtr/min in still water and w mtr/minis speed of water, then   x-w= 1000/20= 
<gadget id="calculator">1000/20</gadget>
<output>50</output>
50   x+w= 1000/12= 250/3   adding   2x= 50 + 250/3= 400/3   x=200/3 mtrs/min   time taken to row 1 kms in still water = 1000/(200/3)= 
<gadget id="calculator">1000/(200/3)</gadget>
<output>15</output>
15 mins.   ANSWER:15 mins
<result>D</result>
Aman can row 1km upstream in 20 min and back to his starting point in 12 min.How long would he take to row 1km in still water?.