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      Question

      A boat takes 12 hours longer to

      cover 378 km upstream than it does to cover the same distance downstream. The speed of the stream is 12 km/h. What is the distance the boat travels downstream in 13 hours?
      A 500 Km Correct Answer Incorrect Answer
      B 446 Km Correct Answer Incorrect Answer
      C 554 Km Correct Answer Incorrect Answer
      D 546 Km Correct Answer Incorrect Answer
      E None of these Correct Answer Incorrect Answer

      Solution

      ATQ, Let the speed of boat in still water= 'd' Kmph 378/(d-12) โ€“ 378/(d+12)=12 378 (d+12-d+12)=12(d -144) 378 (24)=12(d -144) 756= d -144 d =900 d=30 Downstream speed of boat = 30+12 = 42 Kmph Required answer = 42ร—13 = 546 Km

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