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December 20, 2014

December 20, 2014

Posted by **val** on Wednesday, December 5, 2012 at 12:06am.

- math -
**kai**, Wednesday, December 5, 2012 at 12:16amspeed x time = distance

let v be the speed of the second car

We know that:

(v+14) x t = 224

and

v x t = 175

Let's isolate t for both equations. You get:

t = 224 / (v+14)

and

t = 175 / v

We know that t is the same for both, so:

224 / (v+14) = 175 / v

Cross multiply.

224v = 175(v+14)

224v = 175v + 2450

Collect like terms:

49v = 2450

v = 50

Therefore, the speed of the first car is (50+14) = 64 mph, while the speed of the second car is 50 mph.

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