๐Ÿ“ข Too many exams? Donโ€™t know which one suits you best? Book Your Free Expert ๐Ÿ‘‰ call Now!

  • google app store apple app store
  • โœ–

      Question

      A motor-cycle covers 160 km with a speed of 70 km/hr.

      find the speed of the motor-cycle for the next 170 km journey so that the average speed of the whole journey will be 90 km/hr.
      A 150 km/hr Correct Answer Incorrect Answer
      B 126 km/hr Correct Answer Incorrect Answer
      C 120 km/hr Correct Answer Incorrect Answer
      D 140 km/hr Correct Answer Incorrect Answer

      Solution

      Average speed of whole journey = 90 km/hr Using the formula, average speed = 2xy/(x + y) ย x = speed of first 160 km = 70 km/hr 90 = 2 x (70 xย  y)/(70 + y) = 126 km/hr

      Practice Next
      ask-question