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
A. 16 hours
B. 18 hours
C. 20 hours
D. 24 hours

• upstream = 9kmph-1.5kmph = 7.5kmph
  Downstream = 9kmph+1.5kmph = 10.5kmph
  
  total time taken = 105/7.5 + 105/10.5 =24 hrs
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