jmc

Question

This graph shows the linear relationship between the time in seconds, x, for Caroline's walk and the distance in meters, y, Caroline is from her starting point. The graph passes through the point (20,30). According to the graph, how many meters will Caroline walk in exactly one hour? FIGURE

Accepted Answer

Since the line goes through (0, 0) and (20, 30) we know that for every 20 seconds, Caroline goes 30 meters. Thus in one minute (60 seconds), she goes 30 3 = 90 meters. This means that in one hour (60 minutes), she'll go 90 60 = 5400 meters.