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a pipe 50mm in diameter is 6.5m long and the velocity in this pipe is 2.2m/s....

a pipe 50mm in diameter is 6.5m long and the velocity in this pipe is 2.2m/s. if the central 2m of this pipe is replaced by a pipe 75mm diameter, how much head loss would be saved. consider minor losses to be negligible and assume friction factor for a pvc pipe appropriately.
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