Answer
1.5 hours at 70 mph
Work Step by Step
255 total miles, 4.5 hours (30 minute traffic stop included)
$70*(t)+60*(4-t)=255$
$70t+240-60t=255$
$10t=15$
$10t/10 =15/10$
$t=1.5$ hours
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 7 - Section 7.6 - Proportions and Problem Solving with Rational Equations - Exercise Set - Page 540: 50
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