📢 Too many exams? Don’t know which one suits you best? Book Your Free Expert 👉 call Now!

  • google app store apple app store
  • ✖

      Question

      The speed of a boat in still water is 15 km/hr and the

      speed of the stream is 6 km/hr. A man rows to a place at a distance of 63 km and comes back to the starting point. The total time taken by him is:
      A 8 hours Correct Answer Incorrect Answer
      B 13 hours Correct Answer Incorrect Answer
      C 11 hours Correct Answer Incorrect Answer
      D 10 hours Correct Answer Incorrect Answer
      E 14 hours Correct Answer Incorrect Answer

      Solution

      Rate downstream = (15 + 6) kmph = 21 kmph Rate upstream = (15 – 6) kmph = 9 kmph According to the question, Time = Distance/Speed Hence, Required time = 63/21 + 63/9 = 3 + 7 = 10 hours

      Practice Next
      ask-question