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< Exercises

Skill check: Applications to other fields and related rates

An elastic rectangle has a constant area of 200200 square meters and its length LL is increasing at a rate of 4 m/sec4\text{ m/sec} (meters per second).
Determine the exact width WW at the instant the width is decreasing at 0.5 m/sec0.5\text{ m/sec}.
  • Your answer should be
  • an integer, like 66
  • an exact decimal, like 0.750.75
  • a simplified proper fraction, like 3/53/5
  • a simplified improper fraction, like 7/47/4
  • a mixed number, like 1 3/41\ 3/4
m\text{m}