Speed of a boat in standing water is 8 kmph and the speed of the stream is 2 kmph. A man rows to place at a distance of 210 km and comes back to the starting point. The total time taken by him is:  Choose the correct choice.
A) 48 hours	B) 51 hours	C) 36 hours	D) 56 hours	E) None
Sol.   Speed upstream = 6 kmph; Speed downstream = 10 kmph.   ∴ total time taken = [210/6 + 210/10= 
<gadget id="calculator">210/6 + 210/10</gadget>
<output>56</output>
56 hours.   Answer 56 hours
<result>D</result>
Speed of a boat in standing water is 8 kmph and the speed of the stream is 2 kmph. A man rows to place at a distance of 210 km and comes back to the starting point. The total time taken by him is: