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Joan’s washing machine tub is a cylinder with a height of 17 in. and a diameter of 22 in. Her washer was half full of water when it stopped working. The repair person’s pump removed 46.2 in3 of water every second.How many seconds did it take to empty the washer? Use 3.14 to approximate pi, and round your answer to the nearest whole number.

A.

70 s








B.

140 s








C.

280 s








D.

559 s

Sagot :

iGreen
Find the volume of the cylinder and divide by 2:

V = pi * r^2 * h

V = 3.14 * 11^2 * 17

V = 6458.98

Divide by 2 since it's half full:

6458.98 / 2 = 3229.49

Now divide it by 46.2 to see how long it will take to drain out:

3229.49 / 46.2 = 69.902

So it will take approximately 70 seconds to drain out.
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