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[" EXAMPLE 4A tap can fill an empty tank...

[" EXAMPLE 4A tap can fill an empty tank in "12" h "],[" and another tap can empty half the tank in "],[10" h.If both the taps are opened "],[" simultaneously,then how tong would it take "],[" to be filled to half its capacity? "],[[" (a) "10h," (b) "15h," (c) "20h," (d) "30h]]

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