Low Hot Water Pressure in Bathroom Sink and Shower, But That’s Not All?

I have a double sink in the bathroom. Sink ‘A’ has great hot water pressure, Sink ‘B’ has very little, just a trickle. Same for the shower, no hot water pressure. I replaced the faucet in the sink, but it did not help the situation any. The sink ‘B’ and the shower are the last two faucets on the line. Now get this, When you turn the hot water on in the sink ‘B’ and the hot in the shower on at the same time both trickle, and as soon as you turn on the cold water in sink ‘B’ at the same time the water pressure in the shower increases?????? HELP!!!

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