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      Question

      Ratio of speed of boat in downstream and speed of stream

      is 8:3, if speed of current is 6 km/hr, then find distance travelled (in km) upstream in 5 hours.
      A 70 km Correct Answer Incorrect Answer
      B 84 km Correct Answer Incorrect Answer
      C 60 km Correct Answer Incorrect Answer
      D 90 km Correct Answer Incorrect Answer

      Solution

      Let speed of downstream and speed of stream be 8x and 3x respectively. Speed of current => 3x = 6 => x = 2 km/hr Downstream speed = 8 Γ— 2 = 16 km/h Speed of boat = 16 - 2 = 14 km/hr Upstream speed = 14 - 2 = 12 km/h Distance travelled upstream in 5 hr = 12 Γ— 5 = 60 km

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