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July 28, 2014

July 28, 2014

Posted by **todd** on Friday, June 22, 2012 at 7:33am.

of a freight train. The passenger train travles 300 miles in

the same time it takes the freight train to travel 220 miles.

find the speed of each train

- algebra -
**Reiny**, Friday, June 22, 2012 at 8:16amspeed of freight --- x mph

speed of passenger --- x+16 mph

freight can go 220 miles in 220/x hours

pass. can go 300 miles in 300/(x+16) hrs

but those times are the same ....

220/x = 300/(x+16)

cross-multiply

300x = 220x + 3520

80x = 3520

x = 44

the freight goes 44 mph and the passenger train goes 60 mph

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