exam Maths Puzzle Numerical Ability

Can anyone help me with the following problem?

The LORAN system (LOng RAnge Navigation) uses two radio transmitters 26 miles apart to send simultaneous signals. The navigator on

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Please help.
Factor the trinomial.
16x^2 + 40xy + 25y^2 A cone-shaped paper cup is to hold 100 cubic cm of water. Find the height and the radius of the cup that can be made from the least amout of paper.