Function d gives the distance of a boat from the dock t seconds after leaving the dock. Distance is measured in meters.
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If t varies inversely with the speed, the formula for that is 
. If t = 2 and r = 40, then we can solve for k, the constant of variation. Multiply both sides by 40 to get k = 80. Now we need to find the value for t when r = 45. Using the k value we just solved for, we will fill in the equation as 
for a t value of about 1.78 hours