Multiple choice

A car completes a distance in 15 hours at a speed of 138 km/hr. By how much the speed of the car should be decreased so that the distance would covered in 23 hours?

  1. 16 km/hr.

  2. 17 km/hr.

  3. 48 km/hr.

  4. 19 km/hr.

Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Distance = Speed × Time = 138 × 15 = 2070 km. To cover the same distance in 23 hours, new speed = 2070/23 = 90 km/hr. Decrease in speed = 138 - 90 = 48 km/hr.