Question

taps A and B can fill a water tank in 6 and 9 hours respectively. Another tap
can empty the whole tank in 12 hours. How long would they take to fill the tank
call the three taps are opened simultanenusy?
​

Answer 1

Answer:

North Korea and Cuba are the only places you can't buy Coca-Cola. ...

The entire world's population could fit inside Los Angeles. ...

There are more twins now than ever before. ...

The hottest chili pepper in the world is so hot it could kill you. ...

More people visit France than any other country.Mars and Earth have approximately the same landmass. ...

Mars is home to the tallest mountain in the solar system. ...

Only 18 missions to Mars have been successful. ...

Mars has the largest dust storms in the solar system. ...

On Mars the Sun appears about half the size as it does on Earth.North Korea and Cuba are the only places you can't buy Coca-Cola. ...

The entire world's population could fit inside Los Angeles. ...

There are more twins now than ever before. ...

The hottest chili pepper in the world is so hot it could kill you. ...

More people visit France than any other country.Mars and Earth have approximately the same landmass. ...

Mars is home to the tallest mountain in the solar system. ...

Only 18 missions to Mars have been successful. ...

Mars has the largest dust storms in the solar system. ...

On Mars the Sun appears about half the size as it does on Earth.North Korea and Cuba are the only places you can't buy Coca-Cola. ...

The entire world's population could fit inside Los Angeles. ...

There are more twins now than ever before. ...

The hottest chili pepper in the world is so hot it could kill you. ...

More people visit France than any other country.Mars and Earth have approximately the same landmass. ...

Mars is home to the tallest mountain in the solar system. ...

Only 18 missions to Mars have been successful. ...

Mars has the largest dust storms in the solar system. ...

On Mars the Sun appears about half the size as it does on Earth.North Korea and Cuba are the only places you can't buy Coca-Cola. ...

The entire world's population could fit inside Los Angeles. ...

There are more twins now than ever before. ...

The hottest chili pepper in the world is so hot it could kill you. ...

More people visit France than any other country.Mars and Earth have approximately the same landmass. ...

Mars is home to the tallest mountain in the solar system. ...

Only 18 missions to Mars have been successful. ...

Mars has the largest dust storms in the solar system. ...

On Mars the Sun appears about half the size as it does on Earth.

Answer 2

Answer:

Part of the tank filled in one hour =1/6

Part of the tank emptied in one hour =1/12

Net part of the tank filled in one hour = 1/6 - 1/12 = 1/12  

1/12 Part of the tank can be filled in one hour.

∴ The tank will be filled completely in 12 hours