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September 2, 2014

Posted by **Mikel** on Tuesday, March 22, 2011 at 2:02pm.

Is this correct:

380(x-10)=420(x+10)

380x-3800=420x+4200

-420x -420x

-40x-3800=4200

+3800 +3800

-40x=8000

-40x/-40=8000/-40

x=200

is 200 miles the answer?

- Math -
**Mikel**, Tuesday, March 22, 2011 at 2:20pm*I have a correction:

380(x+10)=420(x-10)

- Math -
**Damon**, Tuesday, March 22, 2011 at 2:29pmt (v-10) = 380

t(v+10) = 420

380/(v-10) = 420/(v+10)

so I get

380(v+10) = 420(v-10) yes agree

40 v = 8000

v = 200 miles/hour

- Math -
**Mikel**, Tuesday, March 22, 2011 at 2:34pmThanks

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