Answer
faster car: 21 mph
slower car: 20 mph
Work Step by Step
distance = rate * time
Group A: $d = x*3$
Group B: $t = (x-1)*3$
$d+t=123$
$3x+(x-1)*3=123$
$3x+3x-3=123$
$6x=126$
$6x/6 = 126/6$
$x=21$
$21-1=20$
Algebra: A Combined Approach (4th Edition)
by Martin-Gay, Elayn
Published by
Pearson
ISBN 10:
0321726391
ISBN 13:
978-0-32172-639-1
Chapter 4 - Section 4.4 - Systems of Linear Equations and Problem Solving - Exercise Set - Page 321: 42
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