book Maths Puzzle Numerical Ability

the inlet pipe of an oil tank can fill the tank in 1 hour 30 minutes. the outlet pipe can empty the tank in 1 hour. find how long it takes to empty a full tank if both pipes are

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hi need help w/the following
simplify the following expression
x^-1 - y^-1 /x^-1 + y^-1 I need help!
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Using the index of a sequence as the domain and the value of the sequence as the range, is a sequence a function?

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