exam Maths Puzzle Numerical Ability

P Biconditional not Q, Q Biconditional not R .P Biconditional R
and example from my class

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exam Other Question

a cold water faucet could fill a sink in 15 minutes, and a hot water faucet can fill it in 12 minutes. the drain can empty the sink in 25 minutes. if both faucets are on and the drain is open, how long will it take to fill the sink? 1/3(b+12)-1/4(b+12)