word problem for mathematics

Mathematics
Tutor: None Selected Time limit: 1 Day

May 20th, 2015

336=v*t   t=336/v

336=(v+6)*(t-1)

336=(v+6)*(336/v -1)

336= 336 -v + 2016/v -6

-v + 2016/v -6 = 0

-v^2 - 6v +2016 =0

v^2 + 6v - 2016 =0

D=36+ 8064 =8100

v1= (-6+90)/2=42

v2=(-6-90)/2=-48 (is not the solution)

v=42mph

May 20th, 2015

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