Mathematics, 17.07.2019 08:00, jayy1474

Tap a can till tank in 28 hours, while tap b can fill the same tank in 21 hours. if both taps are open together, how long will it take to fill an empty tank?

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Tap a can till tank in 28 hours, while tap b can fill the same tank in 21 hours. if both taps are op...