If two trains leave Raleigh at the same time, one traveling north, and the other south. The first train travels at 50 miles per hour and the second at 60 miles per hour. In how many hours will the trains be 275 miles apart?
The sum of the two trains' distances is 275: 50 * t + 60 * t = 275110 * t = 275t = 2.5 hours Check:North Train: 50 mph for 2.5 hours = 125 milesS outh Train: 60 mph for 2.5 hours = 150 miles125 + 150 = 275 CHECK, so the answer is 2.5 hours.
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About Hours
An hour consists of sixty minutes. We measure out our days in hours; when we are having fun, an hour is short. While we are suffering, an hour is very very long. In the Middle Ages (the 5th century to the 15th century) Christian monks and artists created 'Books of Hours.' They contained prayers and psalms for each hour of the day. They were 'illuminated,' that is, their texts were illustrated in gold ink and brilliant colors. The Cloisters Museum in NYC has a wonderful collection of Books of Hours.
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