Two trains are headed towards each other on the same track unbeknownst to the engineers.  One departs San Francisco.  Its average speed is 55 miles per hour.   The 2nd departs Seattle at the same time that the first one departs San Francisco.  Its average speed is 65 miles per hour.  The length of track separating the two locations is 860 miles.  How many minutes (from departure time) before the two trains collide?

Algebra and Trigonometry (6th Edition)
6th Edition
ISBN:9780134463216
Author:Robert F. Blitzer
Publisher:Robert F. Blitzer
ChapterP: Prerequisites: Fundamental Concepts Of Algebra
Section: Chapter Questions
Problem 1MCCP: In Exercises 1-25, simplify the given expression or perform the indicated operation (and simplify,...
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Two trains are headed towards each other on the same track unbeknownst to the engineers.  One departs San Francisco.  Its average speed is 55 miles per hour.   The 2nd departs Seattle at the same time that the first one departs San Francisco.  Its average speed is 65 miles per hour.  The length of track separating the two locations is 860 miles.  How many minutes (from departure time) before the two trains collide? 
 
7.17 min.
430 min.
860 min.
794 min.
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