Answer:
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.
