College algebra
posted by Lee .
A person is driving a car on a straight road. The graph shows the distance in y miles that the individual is from home after x hours.
the graph has the following points
(1, 40) and (3, 90)
Find the slope intercept of the line
y = ____x + ______
How fast is the car traveling?
_______ Miles per hour.
(Type and integer or decimal)
How far was the individual from home initally?
________ miles
(Type and integer or decimal)
How far was the individual from home after 3 hours and 15 minutes?
_________ miles
(Type in integer or decimal)
I am unsure how to solve the last couple of parts to this problem.
Help!!!

College algebra 
Kenya
a marble is selected at random from a jar containing 6 red marbles,4 yellow marbles, 2 green marbles. what is the probability of getting a red marble
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