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A tank has 2 inlets and 1 outlet. The inlets P and Q can fill the tank in 15 hrs and 10 hours respectively. The outlet R take 30 hours to empty the tank. The gardener's son opens all the three pipes by mistake. The gardener realizes this after 2 hours and closes the outlet R so that the tank can be filled. Due tA tank has 2 inlets and 1 outlet. The inlets P and Q can fill the tank in 15 hrs and 10 hours respectively. The outlet R take 30 hours to empty the tank. The gardener's son opens all the three pipes by mistake. The gardener realizes this after 2 hours and closes the outlet R so that the tank can be filled. Due to this mistake of his son, how much extra time will be required to fill the tank?o this mistake of his son, how much extra time will be required to fill the tank?