Homework Help: PSAT - Math

Posted by Tiger on Saturday, December 26, 2009 at 9:51pm.

Hello, I am reviewing my psat and looking at the questions I got wrong. I can't understand how to do this problem.

Mike and paul left their houses at the same time for a fitness run to the park. Mike ran at an average speed of 7 miles per hour. Paul ran at an average speed of 5 miles per hour. Mike and Paul arrived at the park at the same time. If Mike ran 4 miles farther than Paul, how far, in miles did Mike run?

PSAT - Math - Quidditch, Saturday, December 26, 2009 at 11:55pm
Mike's time equals Paul's time.

Let D = Paul's distance in miles

Mikes time = (D+4miles)/(7mph)

Paul's time = D/5mph

(D+4miles)/(7mph) = D/(5mph)
Ssolve for D, then find D + 4.

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