Mason is a captain of a tourist cruise to the Statue of Liberty. He identified a few relevant functional relationships and modeled them:
Function | Input | Output
- | - | -
$P$| Duration of the cruise, $r$ | Average number of photos taken by each passenger, $P(r)$
$S$ | Current of the river, $x$ | Speed of the ship, $S(x)$
$D$ | Speed of the ship, $k$ | Duration of the cruise, $D(k)$
**According to Mason's findings, which of the following represents the average number of photos taken per passenger as a function of the speed of the ship?**
[[☃ radio 1]]