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Two wires of different materials P and Q...

Two wires of different materials P and Q have resistance per unit lengths `50 Omega km^(-1)` and `25 Omega km^(-1)` and temperature coefficients of resistance, `0.0025 ^@C^(-1)` and `0.00075^@C^(-1)` respectively. If it is desired to make a coil having `700 Omega` resistance and a temperature coefficient of resistance `0.001^@C^(-1)` by using suitable length of two wires in series. Calculate their respective length.

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