zen the20,1.A water tank is being filled by pumps at a constant rate. The volume of water in the tank V, in gallons, isgiven by the equation:v(t) = 65t + 280, where t is the time, in minutes, the pump has been on(a) At what rate, in gallons per minute, is the (b) How many gallons of water were in the tankwater being pumped into the tank?when the pumps were turned on?Ult=65 1280v101=6510) +250=280rate is 65wakers of gallontank had 280 gallons.(c) What is the volume in the tank after two hours (d) The pumps will turn off when the volume inof the pumps running?the tank hits 10,000 gallons. To the nearestminute, after how long does this happen?edict

Answer:(a) 65 gallons per minute(b) 280 gallons(c) 8080 gallons(d) 150 minutes.Step-by-step explanation:Water is filled up by pumps into a tank at a constant rate. The volume of water in the tank V, in gallons, is given by the equation  V(t) = 65t + 280 ......... (1), where t is the time, in minutes.  (a) The rate at which water is pumped into the tank is 65 gallons per minute. (Answer) (b) 280 gallons of water was there in the tank when the pumps were turned on because f(0) = 65 × 0 + 280 = 280. (Answer) (c) After 2 hours i.e. (2 × 60) = 120 minutes the volume of water in the tank will be f(120) = 65 × 120 + 280 = 8080 gallons. (Answer) (d) The tank has a capacity of 10000 gallons of water. So, if the tank starts to overflow after t minutes, then  10000 = 65t + 280 ⇒ 65t = 9720 ⇒ t = 149.53 minutes ≈ 150 minutes (Answer)