Answer
b
Work Step by Step
Average speed of the vehicle = (40 + 50)/2
= 45 miles per hour
Average time of travel = (3+4)/2 = 3.5 hours
Therefore, distance travelled = Speed x time
= 45 x 3.5
= 157.5
The best estimate is b.
Thinking Mathematically (6th Edition)
by Blitzer, Robert F.
Published by
Pearson
ISBN 10:
0321867327
ISBN 13:
978-0-32186-732-2
Chapter 1 - Problem Solving and Critical Thinking - 1.2 Estimation, Graphs, and Mathematical Models - Exercise Set 1.2 - Page 26: 40
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