SOLUTION: A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass one anoth
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Question 269831: A freight train and an express train leave towns 390km apart, traveling toward one another. The freight train travels 30km per hr slower than the express train. They pass one another 3 hr later. What are their speeds? Answer by drk(1908) (Show Source):
You can put this solution on YOUR website! This is an RTD problem. Here is a table based on the given information
trains . . . . . . . . .rate . . . . . . . . .time . . . . . . . . .distance
freight. . . . . . . . r - 30 . . . . . . . . .3 . . . . . . . . . . 3r - 90
express. . . . . . . .r . . . . . . . . . . . . 3 . . . . . . . . . . . 3r
totals. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .390
Look at the last column, we get
simplify to get
add 90 to get
divide to get
express:
freight:
(