Answer
$30$ minutes
Work Step by Step
This means $x=y$. Plugging this into the equation: $30x+90x=1800\\120x=1800\\x=15$
Then the total trip time is: $x+y=x+x=2x=2(15)=30$ minutes
Algebra 2 (1st Edition)
by Larson, Ron; Boswell, Laurie; Kanold, Timothy D.; Stiff, Lee
Published by
McDougal Littell
ISBN 10:
0618595414
ISBN 13:
978-0-61859-541-9
Chapter 2 Linear Equations and Functions - 2.3 Graph Equations of Lines - 2.3 Exercises - Problem Solving - Page 95: 64c
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