SOLUTION: distance between them is 673 miles. How long will it take for them to collide? (2/2)If 2 trains are traveling on the same track towards each other and one is going 100 MPH and the

Algebra ->  Customizable Word Problem Solvers  -> Travel -> SOLUTION: distance between them is 673 miles. How long will it take for them to collide? (2/2)If 2 trains are traveling on the same track towards each other and one is going 100 MPH and the       Log On

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Question 631373: distance between them is 673 miles. How long will it take for them to collide? (2/2)If 2 trains are traveling on the same track towards each other and one is going 100 MPH and the other is going 87 MPH and the starting distance between them is 673 miles. How long will it take for them to collide?
Answer by josmiceli(19441) About Me  (Show Source):
You can put this solution on YOUR website!
The easiest way is to think of one train as standing still
and the other one traveling at the sum of their speeds.
When the one that is moving covers 673 miles, they collide.
+673+=+%28+100+%2B+87+%29%2At+
+673+=+187t+
+t+=+3.599+ hrs
+.599%2A60+=+36+ min
They will collide in 3 hrs and 36 min