Speed of a boat in standing water is 10kmph and speed of the stream is 2kmph. A man can rows to a place at a distance of 100km and comes back to the starting point. The total time taken by him is?
Choose one:
A) 24hours
B) 21hr 30min
C) 20hr 50min
D) 18hr 15min
E) 22hrs
Speed upstream = 8kmph   Speed downstream = 12kmph   Total time taken = 100/8 + 100/12 = 20 hours 50min   Answer is 20hr 50min
<result>C</result>
Speed of a boat in standing water is 10kmph and speed of the stream is 2kmph. A man can rows to a place at a distance of 100km and comes back to the starting point. The total time taken by him is?