A train leaves Little Rock, Arkansas, and travels north at 70 kilometers per hour. Another train leaves at the same times and travel south at 85 kilometers per hour. How long will it take before they are 620 kilometers apart?

Question

Mathematics

Abbie Walters

17 August, 20:32

A train leaves Little Rock, Arkansas, and travels north at 70 kilometers per hour. Another train leaves at the same times and travel south at 85 kilometers per hour. How long will it take before they are 620 kilometers apart?

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Answers (1)

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Jazmyn Fitzpatrick · Answer 1

distance = rate times time.

Here the distance covered by the first train is (70 km/hr) t (t=# of hours), and that by the second train is (85 km/hr) t.

Add these together and set the sum equal to 620 km:

70t + 85t = 620, or 155t = 620, or 4. It will take 4 hours for the distance between the two trains to increase to 620 km.