[PPSC SCIENTIFIC ASSISTANT (POLYGRAPH)]

17. Two taps can fill a tank in 20 minutes and 30 minutes respectively. There is an outlet tap at exactly half level of that rectangular tank which can pump out 50 litres of water per minute. If the outlet tap is open, then it takes 24 minutes to fill an empty tank. What is

1. 1800 litres

2. 1500 litres

3. 1200 litres

4. 2400 litres

Correct Answer :

1800 litres