Speed of a boat in standing water is 9 kmph and the speed of the stream is 1.5 kmph. A man rows to 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 answers.
A) 12 hours  B) 24 hours  C) 36 hours  D) 48 hours  E) None
Sol.   Speed upstream = 7.5 kmph; Speed downstream = 10.5 kmph.   ∴ total time taken = [105/7.5 + 105/10.5= 
<gadget id="calculator">105/7.5 + 105/10.5</gadget>
<output>24</output>
24 hours.   Answer 24 hours
<result>B</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 place at a distance of 105 km and comes back to the starting point. The total time taken by him is: