Algebra: A Combined Approach (4th Edition)

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: 61

Answer

60 mph for motorcycle, 70 mph for car

Work Step by Step

car: 280 = (r+10)*t motorcycle: 240 = r*t $280 = (r+10)*t$ $280/(r+10)=(r+10)*t/(r+10)$ $280/(r+10) = t$ $240 = r*t$ $240/r = r*t/r$ $240/r = t$ $280/(r+10) = 240/r$ $240 (r+10) = 280 *r$ $240r + 2400 = 280r$ $2400 = 40r$ $2400/40 = 40r/40$ $60 = r$ $r+10$ $60+10$ $70$
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