A rice farmer needs to fill a (150 mathrm{~m} times 400 mathrm{~m}) field with water to a

Question:

A rice farmer needs to fill a $150 \mathrm{~m} \times 400 \mathrm{~m}$ field with water to a depth of $7.5 \mathrm{~cm}$ in $1 \mathrm{hr}$. How many 37.5-cm-diameter supply pipes are needed if the average velocity in each must be less than $2.5 \mathrm{~m} / \mathrm{s}$ ?

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