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What is the pressure drop across a horizontal pipe transporting a mixture of water and oil (60% oil by volume)? The pipe has a 1-inch diameter and a length of 50 meters. The flow rate of the mixture is 0.05 cubic meters per second and the temperature is 25°C. Assume laminar flow and neglect minor losses. Specifically, calculate the pressure drop per unit length in the pipe, considering the effects of the oil phase on the viscosity and density of the mixture.
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Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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