state gov Kolkata Police SI Mock Test 2023 Quantitative Aptitude Time and Work Pipe and Cistern

Three taps A, B and C can fill a tank in 12 hours, 15 hours and 20 hours respectively. If all the taps are opened at 12 PM, then at what time (in PM) should the tap A and C be closed to fill the tank completely at exactly 9 PM?

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