#17 please help I'm so confused.

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01-12-2014
Mathematics

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#17 please help I'm so confused.

Sagot :

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AL2006idn AL2006idn · Answer 1 · 2014-12-01T22:40:38-05:00

Efren walks 4 miles per hour, and has a head start of 1/2 hour.
So he's (1/2 of 4) = 2 miles out ahead when Gregory starts out.

How long does it take Gregory to gain the 2 miles that he's behind ?

Gregory runs at 8.5 mph, while Efren walks at 4 mph.
Gregory gains (8.5 - 4) = 4.5 miles on Efren per hour.
So it'll take him (2/4.5) = 4/9 of an hour to gain the 2 miles.

(2/9 hour) x (60 minutes/hour) = 26 minutes 40 seconds

Gregory catches up with Efren at 9:26:40 AM.

Sagot :

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