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A water tank that holds 60 gallons is filled at a rate of 4/5 of a gallon per second. How long does it take to fill the tank to 2/3 of its capacity?

Respuesta :

2/3 of its capacity - 60 * 2/3 gallons = 40 gallons.

Time to fill to 2/3 is 40 / 4/5 = 40 * 5 / 4

= 50 seconds (answer)

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