And it wants the answers in meters...

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This is what I tried doing so far, but to no avail.

v0=85mph => .0236 m/sec

vf=65mph => .0181 m/sec

t0=0

tf=15sec

a=-4mph/sec

Okay. I've tried this equation x-x0=(1/2)(v0+v)*t and solved for x with an answer of .31275 m, but that doesn't work. :-(

I've tried vf^2=v0^2+2*a(xf-x0) and solve for displacement, but that answer doesn't work either.

Maybe I'm interpreting the initial values wrong or something. Any insight appreciated.