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Q: A boat travels 72 km downstream in 8 hours and 84 km upstream in 12 hours. Find the speed of the boat in still water and the speed of the water current ?

  • 1
    9 and 3 kmph
  • 2
    6 and 7 kmph
  • 3
    8 and 1 kmph
  • 4
    7 and 2 kmph
  • Show Answer
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Answer : 3. "8 and 1 kmph"
Explanation :

Answer: C) 8 and 1 kmph Explanation: Downstream speed = 72km/8hrs  = 9 kmphupstream speed = 84km/12hrs = 7 kmphspeed of boat = avg of downstream and upstream speedsspeed of boat = (9+7)/2kmph = 8 kmph.current speed = half of the difference of downstream and upstream speedscurrend speed = (9-7)/2kmph = 1 kmph

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