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July 25, 2014

July 25, 2014

Posted by **Jam** on Sunday, February 20, 2011 at 4:47pm.

- algebra -
**Helper**, Sunday, February 20, 2011 at 5:23pmDistance D = Rate R * Time T

T = D/R

R = rate for car

R + 40 = rate for train

140/R = time for car

280/(R + 40) = time for train

Times are equal

280/(R + 40) = 140/R

Cross multiply and solve for R, rate for car

R + 40 = rate for train

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