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December 19, 2014

December 19, 2014

Posted by **MARIAH** on Saturday, November 6, 2010 at 5:47pm.

- Algebra -
**Daneeka**, Saturday, November 6, 2010 at 6:46pmits 450 mph

- Algebra -
**PsyDAG**, Sunday, November 7, 2010 at 10:17amSpeed = distance/time

time = distance/speed

Let x = plane speed and y = driving speed

y = x + 200

250/x = 1250/y

Substitute x + 200 for y in second equation and solve for x. Insert that value into the first equation and solve for y. Check by inserting both values into the second equation.

- Algebra -
**Henry**, Sunday, November 7, 2010 at 9:30pmCar speed = X-mi/h,

Plane speed = (X + 200) mi/h,

Eq1: d1 = X*t = 250 mi,

t = 250 / X,

Eq2: d2 = (X + 200)t = 1250 mi.

Substitute 250 / X for t in Eq2:

(X + 200)250/X = 1250,

250 + 50000/X = 1250,

50000 / X = 1250 - 250,

50000 / X = 1000,

Cross multiply:

1000X = 50000,

X = 50000 / 1000 = 50 mi/h = car speed.

(X + 200) = 250 mi/h = plane speed.

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