1 . Two taps A and B can fill a tank in 5 hours and 20 hours respectively. If both the taps are open then due to a leakage, it took 30 minutes more to fill the tank. If the tank is full, how long will it take for the leakage alone to empty the tank ?
- A. 4.5 hrs
- B. 7 hrs
- C. 18 hrs
- D. 36 hrs
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