Alexander B. answered • 10/28/15

Advanced Math and Science Tutoring and Test Prep online (SAT, ACT)

First, notice that labor required to fill the 3000 gallon tank is exactly one half of that required to fill a 6000 gallon tank. Assuming the unknown variable X represents the time in minutes, the apparent linear equation is as following:

( 4 * 40 ) /2 = 5 * X, or

**X = 16**(minutes)