What is the New Average Speed Now? If

The average speed of a car is 90 km/hr. The driver first decreases its average speed by 40% and then increases it by 50%. What is the new average speed now?

  1. 80 km/hr
  2. 81 km/hr
  3. 84 km/hr
  4. 85 km/hr
Desire Adnan Default Asked on 4th August 2015 in Maths.
Add Comment
  • 1 Answer(s)

    Answer: (2) 81 km/hr
    Explanation:-
    The average speed of a car = 90 km/hr.
    The speed decreased by 40 %,
    Then, the speed of car = 90  – 90 x 40/100
    = 90 – 36
    = 54 km/hr

    And the speed increased by 50 %,
    Then, the sped of a car = 54 + 54 x 50 /100
    = 54 + 27
    = 81 km/hr

    Hence ,the new average speed of a car is 81 km/hr.

    Anurag Mishra Professor Answered on 4th August 2015.
    Add Comment
  • Your Answer

    By posting your answer, you agree to the privacy policy and terms of service.