Tank A initially holds 100 gallons of brine that contains 100 lbs of salt while tan B holds 100 gallons of water. Two gallons of water enter tank A each minute an the mixture assumes uniform. The mixture flows from A to B at the same rate and the mixture in tank B also kept uniform. The mixture runs out from tank B the rate of 2 gal/min. At what time "t" that tank B reached its maximum amour of salt?

An inverted pyramid is being filled with water at a constant rate of 45 cubic centimeters per second. The pyramid, at the top, has the shape of a square with sides of length 4 cm, and the height is 7 cm. b1 b2 Find the rate at which the water level is rising when the water level is 3 cm. h cm/sec

An LRT train 6 m above the ground crosses a street at 9 m/s at the instant that a car approaching at a speed of 4 m/s is 12 m up the street. Find the rate of the LRT train and the car separating one second later. A. 3.64 m/s B. 3.94 m/s C. 4.24 m/s D. 4.46 m/s Water is flowing into a conical cistern at the rate of 8 m³/min. If the height of the inverted cone is 12 m and the radius of its circular opening is 6 m. How fast is the water level rising when the water is 4 m deep? A. 0.64 m/min B. 0.56 m/min C. 0.75 m/min D. 0.45 m/min Water is pouring into a conical vessel 15 cm deep and having a radius of 3.75 cm across the top. If the rate at which the water rises is 2 cm/sec, how fast is the water flowing into the conical vessel when the water is 4 cm deep? A. 2.37 m³/sec B. 5.73 m³/sec C. 6.28 m³/sec D. 4.57 m³/sec

A tank contains 2000 liters (L) of a solution consisting of 120 kg of salt dissolved in water. Pure water is pumped into the tank at the rate of 4 L/s, and the mixture-kept uniform by stirring-is pumped out at the same rate. How long will it be until only 12 kg of salt remains in the tank? It will take about seconds. (Round to the nearest second as needed.)