Algebra 1

Published by Prentice Hall
ISBN 10: 0133500403
ISBN 13: 978-0-13350-040-0

Chapter 6 - Systems of Equations and Inequalities - 6-4 Application of Linear Systems - Practice and Problem-Solving Exercises - Page 388: 24

Answer

Speed of boat in still water: 4.5 km/h

Work Step by Step

Let call speed of boat in still water:x then speed of the boat upstream is x-1.5 and speed of the boat downstream is x+1.5 Based on the statement: x+1.5=2(x-1.5)=> x+1.5=2x-3 => x=4.5
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