Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Published by Pearson
ISBN 10: 0-32184-874-8
ISBN 13: 978-0-32184-874-1

Chapter 1 - Introduction to Algebraic Expressions - 1.1 Introduction to Algebra - 1.1 Exercise Set: 28

Answer

(a) 90 sec (b) 270 sec (c) 6 min

Work Step by Step

Justin's time is 3t. (a) If t is 30 sec the time it takes Justin is: $3(30\ sec)=90\ sec$ (b) If t is 90 sec the time it takes Justin is: $3(90\ sec)=270\ sec$ (c) If t is 2 min the time it takes Justin is: $3(2\ min)=6\ min$
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