Question : Pipe A can fill an empty tank in 18 hours and Pipe B can fill the same empty tank in 24 hours. If both the pipes are opened simultaneously, how much time (in hours) will it take to fill the empty tank?

Option 1: $11 \frac{3}{7}$

Option 2: $10 \frac{1}{7}$

Option 3: $10 \frac{2}{7}$

Option 4: $11 \frac{2}{7}$

Question : Pipe A can fill 50% of the tank in 6 hours and Pipe B can fill the same tank in 18 hours. If both the pipes are opened simultaneously, how much time (in minutes) will the empty tank be filled?

Option 1: 420

Option 2: 425

Option 3: 432

Option 4: 435

Question : Pipe A can fill an empty tank in 6 hours and pipe B, in 8 hours. If both pipes are opened and after 2 hours, pipe A is closed, how much time will B take to fill the remaining tank?

Option 1: $7\frac{1}{2}$ hours

Option 2: $2\frac{2}{5}$ hours

Option 3: $2\frac{1}{3}$ hours

Option 4: $3\frac{1}{3}$ hours

Question : An inlet pipe can fill an empty tank in $4 \frac{1}{2}$ hours, while an outlet pipe drains a filled tank in $7 \frac{1}{5}$ hours. The tank is initially empty, and the two pipes are alternately opened for an hour each, till the tank is filled, starting with the inlet pipe. In how many hours will the tank be filled?

Option 1: 24 hours

Option 2: $20 \frac{1}{4}$ hours

Option 3: $20 \frac{3}{4}$ hours

Option 4: $22 \frac{3}{8}$ hours

Question : An inlet pipe can fill an empty tank in 140 hours, while an outlet pipe drains a filled tank in 63 hours. If 8 inlet pipes and y outlet pipes are opened simultaneously, when the tank is empty, then the tank gets filled in 105 hours. Find the value of y.

Option 1: 1

Option 2: 4

Option 3: 2

Option 4: 3