Multiple choice

If a car runs at 60 km/h, it completes a certain distance in 18 minutes. At what average speed, in kilometers per hour, would this car need to cover the same distance in 15 minutes?

  1. 68 km/h

  2. 70 km/h

  3. 72 km/h

  4. 74 km/h

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

Distance = Speed × Time = 60 km/h × (18/60) h = 18 km. To cover 18 km in 15 minutes, speed needed = 18 km ÷ (15/60) h = 18 × 4 = 72 km/h. This uses inverse proportion between speed and time.