Multiple choice

A car covers certain distance in 6 hours at the speed of 80 kmph. The speed of the car is increased by x%, then the car reduce time to cover the distance is one hour. Find the value of x?

  1. 10%

  2. 20%

  3. 25%

  4. 30%
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Distance = 6 * 80 = 480 km. New time = 6 - 1 = 5 hours. New speed = 480 / 5 = 96 kmph. Increase = 96 - 80 = 16. Percentage increase = (16/80) * 100 = 20%.

AI explanation

The total distance is speed multiplied by time, which equals 80 multiplied by 6, giving 480 kilometers. The new time to cover this distance is 6 minus 1, equaling 5 hours. The new speed is 480 divided by 5, resulting in 96 kilometers per hour. The percentage increase in speed is calculated as ((96 minus 80) divided by 80) multiplied by 100, which equals (16 divided by 80) multiplied by 100, resulting in 20 percent.

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