The equation y = 4/20x describes the number of kilometers y that a van travels in x minutes. What is the constant speed of the van in terms of hours? Use pencil and paper. Express the speed in three different ways.
To express the speed in terms of hours, we need to convert the time from minutes to hours. There are 60 minutes in an hour, so we divide x by 60 to convert it to hours.
1. Speed = y / x = (4/20x) / (x/60) = (4/20)(60/x) = 12/x kilometers per hour
2. Speed = y / x = (4/20x) / (x/60) = (4/20)(60/x) = 3/5x kilometers per hour
3. Speed = y / x = (4/20x) / (x/60) = (4/20)(60/x) = 0.6/x kilometers per hour