1. Pat biked 1 mile in 3 minutes with the wind at her back, and then she returned in 4 minutes riding against the wind. What was the speed of the wind?
2. A fraction has a value or 3/4. If 7 is added to the numerator, the resulting fraction is equal to the reciprocal of the original fraction. Find the other fraction.
We are told that she initially bikes 1 mile in 3 minutes. So:
But on the trip back we have
Now, you solve two equations in two unknowns. Easy, right?
Set up your equations and show us your work if you get stuck; you should be able to do this one.