The speed at which a man can row a boat in still water is 15 kmph. If he rows downstream, where the speed of current is 5 kmph, what time will he take to cover 60 metres? Choose the correct option:  A) 16 seconds  B) 76 seconds  C) 10.8 seconds  D) 12 seconds  E) 18 seconds
Speed of the boat downstream = 15 + 5= 
<gadget id="calculator">15 + 5</gadget>
<output>20</output>
20 kmph= 20 * 5/18 = 50/9 m/s   Hence time taken to cover 60 m   = 60*9/50= 
<gadget id="calculator">60*9/50</gadget>
<output>54/5 = around 10.8</output>
10.8 seconds.   Answer: 10.8 seconds
<result>C</result>
The speed at which a man can row a boat in still water is 15 kmph. If he rows downstream, where the speed of current is 5 kmph, what time will he take to cover 60 metres?