Answer:
Tom will take 5 hours
Step-by-step explanation:
Unit Rate
To<em>m runs 12 miles in 3 hours. We can calculate two different unit rates:</em>
<em />
<em>12 miles / 3 hours = 4 miles/hour</em>
<em />
<em>3 hours / 12 miles = 0.25 hours/mile</em>
<em />
<em></em>
<em>The first rate measures how many miles Tom runs per hour. The second rate measures how long it takes to Tom to run one mile.</em>
<em />
<em></em>
<em>We are asked to find the time needed for Tom to run 20 miles, thus the second rate will be useful:</em>
0.25 hours/mile * 20 miles = 5 hours
To run 20 miles, Tom will take 5 hours