Problema Solution
A woman drives for a total of 10 hours. She drives for t hours at a rate of 45 mph, and the remaining time at a rate of 55 mph. Express the total distance covered, d, as a function of t.
Answer provided by our tutors
d = 45 t + 55 ( 10 - t )
d = -10 t + 550 .. ... .. . . . . .