Question

Q8. A tank of capacity 600 litres is
attached with two pipes P1 and P2
at the top and another pipe P3 at
the bottom of the tank. P1 and P2
fill the tank at the rate of four litres
per minute and six litres per
minute respectively while P3
empties the full tank in five hours.
All the three pipes are opened
when the tank is empty. In how
much time will the tank be filled?
*
75 minutes
70 minutes
80 minutes
90 minutes
none​

Answer 1

Answer:

75 minutes

Step-by-step explanation:

P3 empties the tank at the rate of 120 liters per hour = 2 liters per min

P1 = 4 liters per min

P2 = 6 liters per minute

Total capacity of the tank in 1 minute = 4 + 6 - 2 = 8 liters

Time taken to fill a tank of capacity 600 liters = 600/8 = 75 minutes