The speed at which a girl can row a boat in still water is 30 kmph. If she rows downstream, where the speed of current is 6 kmph, what time will he take to cover 240 metres? Choose the most appropriate option:
A) 21	B) 22	C) 23	D) 20	E) 24
Speed of the boat downstream = 30 + 6= 
<gadget id="calculator">30 + 6</gadget>
<output>36</output>
36 kmph= 36 * 5/18= 
<gadget id="calculator">36 * 5/18</gadget>
<output>10</output>
10 m/s   Hence time taken to cover 240 m= 240/10= 
<gadget id="calculator">240/10</gadget>
<output>24</output>
24 seconds.   Answer: 24
<result>E</result>
The speed at which a girl can row a boat in still water is 30 kmph. If she rows downstream, where the speed of current is 6 kmph, what time will he take to cover 240 metres?