Multiple choice

The speed of a car is 40 km/h and it takes 5 hour to complete a certain distance. If the speed of car reduces by 15 km/h and it has to cover same distance. Find percentage change in time (in terms of hour).

  1. 80%

  2. 60%

  3. 50%

  4. 45%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Distance = Speed × Time = 40 × 5 = 200 km. New speed = 40 - 15 = 25 km/h. New time = 200/25 = 8 hours. Percentage change = (8 - 5)/5 × 100 = 3/5 × 100 = 60% increase in time.

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