Prealgebra (7th Edition)

Published by Pearson
ISBN 10: 0321955048
ISBN 13: 978-0-32195-504-3

Chapter 6 - Section 6.5 - Congruent and Similar Triangles - Exercise Set - Page 454: 36


40.2 mph

Work Step by Step

Write a proportion. Mph decrease is to mph decrease as time is to time. $\frac{3}{x}=\frac{5}{8}$ $\longrightarrow$cross multiply to solve for x $5x=3\times8$ $\longrightarrow$multiply $5x=24$ $\longrightarrow$multiplication property of equality $5x\div5=24\div5$ $\longrightarrow$divide $x=4.8$ New speed is $45-4.8=40.2$
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