The speed at which a man can row a boat in still water is 6.5 kmph. If he rows downstream, where the speed of current is 2.5 kmph, what time will he take to cover 90 metres?	Select: A) 90 seconds B) 36seconds C) 26 seconds D) 18 seconds E) 6.5 seconds
Speed of the boat downstream = 6.5 + 2.5= 
<gadget id="calculator">6.5 + 2.5</gadget>
<output>9</output>
9 kmph= 9 * 5/18= 
<gadget id="calculator">9 * 5/18</gadget>
<output>5/2 = around 2.5</output>
2.5 m/s   Hence time taken to cover 90m=90/2.5= 
<gadget id="calculator">90/2.5</gadget>
<output>36</output>
36 seconds.   Answer:36seconds
<result>B</result>
The speed at which a man can row a boat in still water is 6.5 kmph. If he rows downstream, where the speed of current is 2.5 kmph, what time will he take to cover 90 metres?