Problema Solution
In the morning, Maria drove to a business appointment at 90 mph. Her average speed on her return trip in the afternoon was 80 mph. The return trip took her 1/2 hours longer because of heavy traffic. How far did she travel to the appointment?
Answer provided by our tutors
First, lets write some equations from the given information using the general equation D=RT (distance=rate*time):
To the appointment:
D=90T
Where 'D' is the distance and 'T' is the time.
From the appointment:
D=80(T+.5)
Where 'D' is the distance (same as before) and 'T+.5' is the time.
Using Algebrator to solve for 'D', we get:
D=360miles