College Algebra 7th Edition

Published by Brooks Cole
ISBN 10: 1305115546
ISBN 13: 978-1-30511-554-5

Chapter P, Prerequisites - Section P.9 - Modeling with Equations - P.9 Exercises - Page 72: 59

Answer

$4$ hours

Work Step by Step

Let $x$ be the time she spent on the train in hours, then she spent $5.5-x$ hours on the bus. Then the equation for her journey is: $60x+40(5.5-x)=300\\60x+220-40x=300\\20x=80\\x=4$ Thus she spent $4$ hours on the train.
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