Algebra 1: Common Core (15th Edition)

Published by Prentice Hall
ISBN 10: 0133281140
ISBN 13: 978-0-13328-114-9

Chapter 2 - Solving Equations - 2-7 Solving Proportions - Practice and Problem-Solving Exercises: 59

Answer

x = 22 hours

Work Step by Step

Step 1) 15sec/ft = x/5280ft Step 2) 15sec/ft * 5280 = x/5280 * 5280 Step 3) 79, 200sec = x hours Step 4) 79, 200 seconds ÷ 3600 sec = 22 hrs An insect crawls 1 ft in 15 seconds. To find the number of hours it will take to crawl 1 mile, set up a proportion. 15 sec/1 ft equals x seconds/5280 ft (because there are 5280 feet in a mile). Cross-multiply and solve for x. Then, divide x by 3600 seconds (because there are 3600 seconds in one hour) to get the number of hours it will take to crawl 1 mile.
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