The speed at which a girl can row a boat in still water is 75 kmph. If he rows downstream, where the speed of current is 15 kmph, what time will he take to cover 300 metres?
Choose the correct choice from the following answers:  A) 16  B) 17  C) 18  D) 19  E) 20
Speed of the boat downstream = 75 + 15= 
<gadget id="calculator">75 + 15</gadget>
<output>90</output>
90 kmph= 90 * 5/18= 
<gadget id="calculator">90 * 5/18</gadget>
<output>25</output>
25 m/s   Hence time taken to cover 400 m= 400/25= 
<gadget id="calculator">400/25</gadget>
<output>16</output>
16 seconds. 16nswer: 16
<result>A</result>
The speed at which a girl can row a boat in still water is 75 kmph. If he rows downstream, where the speed of current is 15 kmph, what time will he take to cover 300 metres?