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      Question

      Speed of a boat in still water to speed of boat in

      upstream is 7: 6. If the boat can travel 320 km in downstream in 4 hours, then find the time taken by the boat to cover 21 km in still water.
      A 30 minutes Correct Answer Incorrect Answer
      B 15 minutes Correct Answer Incorrect Answer
      C 10 minutes Correct Answer Incorrect Answer
      D 18 minutes Correct Answer Incorrect Answer

      Solution

      Let speed of boat in still water and speed of boat in upstream be β€˜7x’ km/h and β€˜6x’ km/h, respectively. Speed of stream = 7x – 6x = x km/h Speed of boat in downstream = 7x + x = 8x km/h So, 8x = 320/4 => x = 10 Speed of boat in still water = 7 Γ— 10 = 70 km/h Desired time = 21/70 x 60 = 18 minutes

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