Given the equation:
d = 58t
Where d is the distance(miles) and t is the time(hour).
Using the distance formula:
Distance = speed x time
Where, speed = 58 miles/hr.
Using the equation:
y = kx
Where k is the constant of proportionality
The constant of proportionality can be said to be the ratio betwen two proportional quantities.
Compare both equations:
d = 58t
y = kx
Therefore, the constant of proprtionality is 58 miles per hr.
Here, the car will drive for 58 miles in one hour, which is the speed.
Since the constant of proportionality is the speed, the correct unit of speed is mph.
The constant of proportionality with the correct unit is = 58 mph
ANSWER:
58 mph