Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is:	Options
A) 16 hours  B) 18 hours  C) 20 hours  D) 24 hours  E) 26 hours
speed of upstream=9-1.5= 
<gadget id="calculator">9-1.5</gadget>
<output>7.5</output>
7.5kmph   speed of down stream=9+1.5= 
<gadget id="calculator">9+1.5</gadget>
<output>10.5</output>
10.5kmph   total time=(105/7.5)+(105/10.5)= 
<gadget id="calculator">(105/7.5)+(105/10.5)</gadget>
<output>24</output>
24hrs   ANSWER:24 hours
<result>D</result>
Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to a place at a distance of 105 km and comes back to the starting point. The total time taken by him is: