Question

When Susan rides her bike, the distance that she travels varies directly with the amount of time she is biking. Suppose she bikes 50 miles in 2.5 hours. At this rate, how many hours would it take her to bike 80 miles?

Answer 1

d=rt 50=2.5r r=20	Use first d=rt equation to solve for the rate
80=rt 80=20t t=4	Multiply everything by 100 to simplify
t=4 hours

t=4 hours