exam Maths Puzzle Numerical Ability

an electrician can install the electric wires in a house in 14 hours.a second electrician requires 18 hours. how long would it take both electricians, working together, to install the wires?

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exam Other Question
A farmer has 680 feet of fencing to enclose a pasture. Because a river runs along one side, fencing will be needed only on three sides. Find the dimensions of the pasture if its length is double its width. 4+2m-m