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  3. Two trains running on parallel tracks are 600 miles apart. One train is moving east at a speed of 90 mph, while the other is mov

Two trains running on parallel tracks are 600 miles apart. One train is moving east at a speed of 90 mph, while the other is mov

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问题 Two trains running on parallel tracks are 600 miles apart. One train is moving east at a speed of 90 mph, while the other is moving west at 75 mph. How long will it take for the two trains to pass each other?
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答案3.64 hours
解析 This is a standard Rate × Time = Distance problem. Since the two trains start 600 miles apart, the combined distance traveled by both trains must equal 600. Using the R × T = D formula, you know that(Rate of Train 1 × Time of Train 1)+(Rate of Train 2 x Time of Train 2)= 600. You are given that the rate of travel is 90 mph for the first train and 75 mph for the second train, and the distance traveled is 600 miles; therefore, you must solve for T, as follows:
90T+ 75T= 600
165T= 600
T =(approximately)3.64 hours
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