Algebra: Word Problem
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At 10:00 a.m., train A leaves the station heading east at 40 m.p.h. At 11:00 a.m., train B leaves the same station heading North 30 degrees W (theta = 120 degrees) at 70 m.p.h. How fast is the distance changing at 12:00 noon. Give both the exact answer and a one decimal place approximation.
You may find it helpful to plot the the positions of the trains and station at noon on a set of coordinate axes, the law of cosines is useful too.
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Solution Summary
This solution provides assistance with rate, time, and distance problems.
Education
- BSc, University of Bucharest
- MSc, Ovidius
- MSc, Stony Brook
- PhD (IP), Stony Brook
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