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December 21, 2014

December 21, 2014

Posted by **stella** on Wednesday, December 14, 2011 at 8:29pm.

the Christmas holiday and the other friend

is heading south. If when they start,

they are 1029 miles apart and one car is traveling at 53 miles per hour, and the other 45 miles per hour, how many hours

before the two cars pass each other?

- 8th grade math -
**Lana**, Wednesday, December 14, 2011 at 10:45pm1,029 : (53 + 45) = 10.5

You don't know how long time will it take the cars to pass each other, so you assign letter "X" to the unknown time. Then multiply each car's speed by the time it would take for them to pass each other (e.g. by "X"). You'll get the following equation:

53x + 45x = 1,029

98x = 1,029

x = 1,029 / 98

x = 10.5

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