Time Distance Distance / Time 2hrs 90 miles 90 miles / 2 hrs = 45 miles / hr 3hrs 135 miles 135 miles / 3 hrs = 45 miles / hr 5hrs 225 miles 225 miles / 5 hrs = 45 miles / hr 6hrs 270 miles 270 miles / 6 hrs = 45 miles / hr
Constant of proportionality is 45 miles / hr. This is the same for the four values. The unit rate is also 45 miles / hr.
Let us assume the Distance , d is directly proportional to Time, t d α t d = kt Constant of proportionality is k which is D/T d = 45t
