If darin traveled 30 miles in 2 hours, and ed traveled three times as far in half the time, what was ed's average speed in miles per hour?

Elementary Algebra
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Author:Lynn Marecek, MaryAnne Anthony-Smith
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Chapter3: Math Models
Section: Chapter Questions
Problem 441PT: Two planes leave Dallas at the same time. One heads east at a speed of 428 miles per hour. The other...
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If darin traveled 30 miles in 2 hours, and ed traveled three times as far in half the time, what was ed's average speed in miles per hour?
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