Question
A gardener is digging a plot of land. As he gets tired, he works more slowly. After $t$ minutes, he is digging at a rate of $\frac{2}{\sqrt{t}}$ square metres per minute. How long will it take him to dig an area of 40 square metres?
A gardener is digging a plot of land. As he gets tired, he works more slowly. After $t$ minutes, he is digging at a rate of $\frac{2}{\sqrt{t}}$ square metres per minute. How long will it take him to dig an area of 40 square metres?