Determine the Constant of Variation for the Stated Condition $t$ Varies Directly As

Multiple Choice

Determine the constant of variation for the stated condition.
- $t$ varies directly as $\mathrm { r }$ and inversely as $\mathrm { s }$ , and $\mathrm { t } = 2$ when $\mathrm { r } = 30$ and $\mathrm { s } = 75$ .

A) $k = 5$
B) $\mathrm { k } = \frac { 1 } { 5 }$
C) $\mathrm { k } = \frac { 2 } { 5 }$
D) $\mathrm { k } = 15$