ЁЯУв Too many exams? DonтАЩt know which one suits you best? Book Your Free Expert ЁЯСЙ call Now!
  • google app store apple app store
    • тЬЦ

      Question

      A man can go on a motor boat with a speed of 15 km/hour

      in still water, he goes to a certain distance upstream and come back to the starting point in a river which flows at a speed of 5km/hour. Find the average speed of motor boat for total journey?
      A 34/3 km/hour Correct Answer Incorrect Answer
      B 40/3 km/hour Correct Answer Incorrect Answer
      C 35/3 km/hour Correct Answer Incorrect Answer
      D 41/3 km/hour Correct Answer Incorrect Answer

      Solution

      Let, the speed of boat be u km/hour and speed of current be v km/hour Average speed = (u2 - v2)/u = (225-25)/15 = 13*1/3 km/hour Alternate Method :- Average speed = (Total distance covered)/(total time taken) = (2×60)/9 =40/3 km/hour

      Practice Next
      More Boats and streams Questions

      Relevant for Exams:

      ask-question