Multiple choice

A train moving at a speed of 80 km/h can cover a certain distance in 4.5 hours. Find the speed of the train to cover the same distance in 4 hours.

  1. 100 km/h

  2. 70 km/h

  3. 85 km/h

  4. 90 km/h
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D Correct answer
Explanation

The distance is constant, so speed and time are inversely proportional. Distance = 80 km/h * 4.5 h = 360 km. To cover 360 km in 4 hours, the required speed is 360 / 4 = 90 km/h.

AI explanation

First, find the total distance using the formula distance equals speed multiplied by time, which gives 80 km/h multiplied by 4.5 hours, equaling 360 km. To cover this same distance in 4 hours, the required speed is distance divided by time, so 360 km divided by 4 hours, which equals 90 km/h.

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