given the equation c(x)=0.4/x^2, where x is equal to distance in miles, find the instantaneous velocity at x=5 and x=11

Answer 1

Find the C ' (derivative) = -0.8/x³

Now evaluate C'(5) = -0.8/125 and C'(11) = -0.8/1331

to state the measure unit you need to know the unit of time (hours, minutes, seconds)