Multiple choice

A train traveling at 60 miles per hour takes 3 hours to reach its destination. If the train increases its speed by 30 miles per hour, how much time will it save on the return trip?

  1. 20 minutes

  2. 30 minutes

  3. 45 minutes

  4. 60 minutes

  5. 90 minutes
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D Correct answer
Explanation

Distance = 60 * 3 = 180 miles. New speed = 60 + 30 = 90 mph. New time = 180 / 90 = 2 hours. Time saved = 3 - 2 = 1 hour = 60 minutes.

AI explanation

Using the formula distance = speed multiplied by time, the distance is 60 times 3, equaling 180 miles. The increased speed for the return trip is 60 plus 30, equaling 90 miles per hour, making the new travel time 180 divided by 90, or 2 hours. The train originally took 3 hours, so the time saved on the return trip is 1 hour, which is 60 minutes.

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