Answer
128 km/hr
Work Step by Step
The time required to reach the interview is 3hours 15minutes.
Let the least speed in the remaining distance be $v$.
We have:
$100/100 +40/40 + 160/v = 3.25 hr$
$160/v = 1.25 hr$
$v = 128 km/hr$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 2 - Motion Along a Straight Line - Problems - Page 33: 11
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