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October 21, 2014

October 21, 2014

Posted by **dell** on Friday, November 2, 2012 at 12:52pm.

- math -
**Reiny**, Friday, November 2, 2012 at 5:26pmYour diagram should be a right-angled triangle with sides 80, 2r, and hypotenuse 100

(2r)^2 + 80^2 = 100^2

4r^2 = 3600

r^2 = 900

r = √900 = 30

The other car was going 30 mph

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