Differentiation & Applications · JEE Main previous year questions

2012 1 question

1. Q142012 · 12 May 2012 · Shift 1

   Consider a rectangle whose length is increasing at the uniform rate of $2m/sec$, breadth is decreasing at the uniform rate of $3m/sec$ and the area is decreasing at the uniform rate of $5{\mathrm{m}}^2/sec$. If after some time the breadth of the rectangle is $2\mathrm{m}$ then the length of the rectangle is

   1. A.$2\mathrm{m}$
   2. B.$4\mathrm{m}$
   3. C.$1\mathrm{m}$
   4. D.$3\mathrm{m}$
   Show answer

   Answer: D