CPM Homework Help : MC2 Problem 9-45

Michaela is swimming at a rate of $25$ feet in $4$ minutes. At this rate, how far will she swim in $15$ minutes?

Hint:

Identify this as a proportional relationship problem.

Help:

One ratio could be $25$ feet: $4$ minutes.
What would be the corresponding equivalent ratio?

Step (1):

Cross multiplication method: $\frac{25\ \text{feet}}{4\ \text{minutes}}=\frac{x\ \text{feet}}{15\ \text{minutes}}$

Step (2):

$25(15)=x(4)$

Solve for $x$ .

Answer:

$93.75$ feet