Mathematics · Time and Work
Two pipes P and Q can fill an empty water tank in 1 hour and 1 hour 20 minutes respectively. Another pipe R can empty the full tank in 2 hours. Pipes P and Q are opened at the same time. After 30 minutes, if pipe R is also opened, then find the time taken by all 3 pipes to fill the remaining tank.
- 16.4 minutes
- 28 minutes
- 36 minutes✓
- 47.2 minutes
Correct answer
6 minutes
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