Answer
1 month.
Work Step by Step
The next trip to the barber shop will happen in $=\frac{3.5-1.5}{2}$ month = 1 month.
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 2 - Kinematics: Description of Motion - Learning Path Questions and Exercises - Exercises - Page 61: 19
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