AP® Calculus AB-BC

Free Version

Upgrade subject to access all content

Moderate

Related Rates and Parametric Equations, Walking Through City

APCALC-M1LMST

Sean and Allison are walking through a city decide to go in different directions at an intersection. Sean heads south at $3\text{ mph}$ and Allison heads west at $3.2\text{ mph}$.

After $15\text{ minutes}$ at what rate is the distance between Sean and Allison changing?​

A

$3.5 \text{ mph}$

B

$1.24 \text{ mph}$

C

$1.114 \text{ mph}$

D

$4.386 \text{ mph}$