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July 30, 2014

July 30, 2014

Posted by **Luicia** on Wednesday, October 3, 2012 at 7:14am.

- Physics -
**Jennifer**, Wednesday, October 3, 2012 at 10:14amFirst, make sure all units are compatible:

Convert 15 minutes to hours, since the speeds are listed in km per hour.

15 minutes / 60 min/hr = .25 hours

Set up algebra equations:

Then let x be the distance traveled by the car that travels at 70 km/hr

Let y be the distance traveled by the car that travels at 80 km/hr

Let t be the time

When the second car starts, the first car has already traveled 70 km/h * .25 h = 17.5 km

x = 17.5 + 70*t

y = 80 * t

The cars will meet when x = y, or when

80*t = 17.5 + 70*t

Solve for t, the time at which they meet. Plug back t into the equation for x or y to find the distance at which they meet.

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