When both quantities in a rate are fractions, what strategy do you use to write the rate as a unit rate?
Hint
1. Multiply both quantities by the second quantity in the ratio.
2. Add the reciprocals of the first and second quantity in the ratio.
3. Multiply both quantities by the reciprocal of the second quantity in the ratio.
4. Divide both quantities by the reciprocal of the first quantity in the ratio.