Posted by smith lionel on Friday, January 13, 2012 at 11:55am.
MVT states that for an interval [a,b] there is a c such that f'(c) = (f(b)-f(a))/(b-a)
Here letting f(x) be distance at time x minutes,
f(0) = 0
f(5) = 4
(f(5)-f(0))/(5-0) = 4/5 mi/min (that's 48 mph)
MVT states that at some 0<= c <= 5, f'(x) = 4/5
f'(x) is the speedometer reading at x minutes.
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