The speed of the boat in still water in 12 kmph. It can travel downstream through 45 kms in 3 hrs. In what time would it cover the same distance upstream?

A. 8 hours

B. 6 hours

C. 4 hours

D. 5 hours

• Still Water=12km/hr
  Downstream=45/3=15km/hr
  Upstream=>> still water=(u+v/2) =>> 12=u+15/2 = 9km/hr
  So time taken in upstream = 45/9 =5hrs
• 9 years agoHelpfull: Yes(10) No(3)
• Speed of the boat in still water = 12 km/hr
  
  Speed downstream = 45⁄3 = 15 km/hr
  
  Speed of the stream = 15-12 = 3 km/hr
  
  Speed upstream = 12-3 = 9 km/hr
  
  Time taken to cover 45 km upstream = 45⁄9 = 5 hours
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