Andrew is going to drive from his house to City A without stopping. An equation that determines Andrew's distance from City A t
t hours after leaving his house is
D
=
240
−
30
t
.
D=240−30t. What is the slope of the equation and what is its interpretation in the context of the problem?

When visiting his parents, tyler drives at an average speed of 42 km/h through urban areas, and at an average speed of 105 km/h along the motorway. his journey usually takes him 2.5 hours. one day when there is a fog, he sets off 1 hour early and only manages to average 28 km/h in urban areas and 60 km/h on the motorway. he arrives 30 minutes late. how long was tyler journey?