The pump used to fill the water tank on a fire truck takes 40 minutes to fill the tank. if the pump sending water to the hose is on, it takes 60 minutes to fill the tank. if the pump filling the water tank is off, how long does the pump sending water to the hose take to empty the tank? a) 120 minutes b) 60 minutes c) 30 minutes d) 24 minutes

A) 120 minutes

Step - by - step explanation:

The pump used to fill the water tank on a fire truck takes 40 minutes to fill the tank.

If the pump sending water to the hose is on, it takes 60 minutes to fill the tank.

Let's "x" be the amount of time to taken the pump sending water to the hose take to empty the tank.

1/40 - 1/x = 1/60

1/x = 1/40 - 1/60

1/x = (3 - 2)/120             Taking LCM as 120

1/x = 1/120

Cross multiplying, we get

120 = 1x

x  = 120/11

x = 120 minutes

Thank you.

.24

step-by-step explanation:

the probability is   .24

the first player had the highest probability of getting a silver marble

the game could be made fair by adding back the marble that was drawn after each draw

so, converting firstly the mixed fractions to improper fractions and then "adding".