How many minutes will it take to completely fill a water tank with a capacity of 3,750 cubic feet if the water is being pumped into the tank at the rate of 800 cubic feet per minute and is being drained out of the tank at the rate of 300 cubic feet per minute?
(A) 3 min. 36 sec.
(B) 6 minutes
(C) 7 min. 30 sec.
(D) 8 minutes
(E) 1,875 minutes
Solution for GRE Math Problem 68:
The legs of triangle BCE equal to the sides of the square ABCD. So, its area is the half of the area of ABCD. Thus, the area of ABCD is 16
Answer:(C) 16
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