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 3 kmph, what time will he take to cover 30 metres? Select
A) 22 seconds  B) 6 seconds  C) 7 seconds  D) 1 seconds  E) 2 seconds
Speed of the boat downstream   = 15 + 3= 
<gadget id="calculator">15 + 3</gadget>
<output>18</output>
18 kmph= 18 * 5/18= 
<gadget id="calculator">18 * 5/18</gadget>
<output>5</output>
5 m/s   Hence time taken to cover 60 m= 30/5= 
<gadget id="calculator">30/5</gadget>
<output>6</output>
6 seconds.   Answer:6 seconds
<result>B</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 3 kmph, what time will he take to cover 30 metres?