SOLUTION: Dear Sir, MY friend had done this but I can't really understand what he had written. The cross-section of a drain is a rectangle 30 cm wide. If the water 3.5 cm deep flows alo

Question 44745: Dear Sir,
MY friend had done this but I can't really understand what he had written.
The cross-section of a drain is a rectangle 30 cm wide. If the water 3.5 cm deep flows along the drain at a rate of 22 cm per second, how many litres of water will flow through each minute ?
Volume = width x depth x height
(width and depth are given namely 30 and 3.5 as for the height is the water flows along the drain is consider its length, in this case, 22 ? (Am I right ?)
If this is true, volume per second = 30 x 3.5 x 22 = 2310 cm^3
Therefore, volume per minute = 2310 x 60 = 138600
Since the answer is required in litres thus 138600 cm^3 = 138 600/1000 = 138.6 litre.

Thank you.
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
I didn't check your arithmetic but
the logic looks right.
Cheers,
Stan H.
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