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A gardener is digging a plot of land. As...

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 `(2)/(sqrt(t))` square metres per minutes. How long will it take him to dig an area of 40 square meters ?

A

100 minutes

B

10 minutes

C

30 minutes

D

40 minutes

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The correct Answer is:
A
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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 (2)/(sqrt(t)) square metres per minute. How long will it take him to dig an area of 40 square metres ?

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