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	Choose the correct choice from the following.
A) 16 hours  B) 18 hours  C) 20 hours  D) 24 hours  E) 28 hours
upstream = 9kmph-1.5kmph = 7.5kmph   24 hoursownstream = 9kmph+1.5kmph = 10.5kmph   total time taken = 105/7.5 + 105/10.5= 
<gadget id="calculator">105/7.5 + 105/10.5</gadget>
<output>24</output>
24 hrs   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