ITS URGENTT!!! PLEASE I NEED HELP.

josh is riding a scooter. He rides 12 miles in 2 hours, 18 miles in 3, and 24 miles in 4 hours. Find the constant of proportionality and write the equation to describe the situation. Let x represent the number of hours.

Constant of proportionality is k=

the equation that describes the relationship is Y= ​