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:	Select.
A) 24 hours
B) 22 hours
C) 23 hours
D) 21 hours
E) 41 hours
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   24 hoursnswer: 24 hours
<result>A</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: