User:DavidHedin

Functions unit

$$y=2x$$

Is this a function?

vs

$$2y=x$$

A car traveled 281 miles in 4 hours 41 minutes. What was the average speed of the car in miles per hour?

Hint: Don't forget to convert your units.

Solution

We first convert the time of 4 hours 41 minutes in minutes

4 hours 41 minutes = 4 × 60 + 41 = 281 minutes

Average speed S is given by distance / time. Hence

S = 281 miles / 281 minutes = 1 mile / minute

= 60 miles / hour