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Mathematics 21 Online
OpenStudy (saifoo.khan):

Need serious help here;

OpenStudy (saifoo.khan):

New question: Jeff starts driving at 75 mph from the same point that Lauren starts driving at 50 mph. They drive in opposite directions, and Lauren has a half-hour head start. How long will they be not able to talk on their cell phones that have a 300 mile range?

OpenStudy (saifoo.khan):

I think it's B.

OpenStudy (saifoo.khan):

x > =11/5 ?

OpenStudy (saifoo.khan):

meaning 2.2

OpenStudy (saifoo.khan):

YES! 2hrs 12mins

OpenStudy (anonymous):

Yep it: 75x+50x+50*1/2=300

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