A tank is draining and a student is asked how fast the depth falls when the volume is changing at a known rate. That is again a problem of:
- Repeated trials
- Reduced fractions
- Rational roots
- Related rates
Show answer and solution
Correct answer: D. Related rates
1. Depth and volume are linked by the tank's geometry.
2. Differentiating that link with respect to time connects the two rates.
3. It is a related rates problem.
_Source: OpenStax Calculus Volume 1, Chapter 4, Applications of Derivatives._