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then you have a second tube with a fluid with twice the viscosity which is moving in a pipe whose length is 3 times the original with a radius 1.5 times the original. The pressure difference across this new pipe is 1/3 that of the original. What is the flow in the new pipe?

Again I have no idea where to start. What is the formula? I wonder if anyone could figure out how fast my professor could travel down that pipe of course using the same diameter? Sorry I just had to say it. Thanks for any help!