Answer
55 mph on the level road
Work Step by Step
level road: 3 hours, (r+20)
winding road: 4 hours, r
total distance: 305 miles
$3(r+20) + 4*r=305$
$3r+60 +4r=305$
$7r +60 = 305$
$7r = 245$
$7r/7 = 245/7$
$r= 35$
$r+20$
$35+20$
$55$
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 541: 62
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