Question

Train A has a speed 20 miles per hour greater than that of train B. If train A travels 320 miles in the same times train B travels 280 miles, what are the speeds of the two trains?

Answer 1

• A: 160 mph
• B: 140 mph

Explanation:

The difference in distance traveled is 40 miles, so each train must have traveled 2 hours.

Train A speed = (320 mi)/(2 h) = 160 mi/h

Train B speed = (280 mi)/(2 h) = 140 mi/h

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The difference in speed means Train A gains on Train B by 20 miles each hour. After 2 hours, it will have gone 40 miles farther.