Rework problem X3-1 if the heat exchanger is redesigned to have the hot water enter the heat exchanger at 60 C (answers:4 and 3.
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The first question asking to rework the problem with the heat exchanger being redesigned to have the hot water enter the heat exchanger at 60C is where I'm stuck at. The second picture is the original problem it is asking to be reworked.

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Rework problem X3-1 if the heat exchanger is redesigned to have the hot water enter
the heat exchanger at 60 C (answers: 27.4 and 3.1 m).

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A single-pass parallel flow heat exchanger will be used to heat a 0.50 kg/s stream of air
from 20'C to 35.C. The air will be heated with a 0.25 kg/s stream of hot water that
flows in the inside tube. UP=90 W/m . K for the heat transfer from the water to the
air. The hot water will enter the heat exchanger at 50 C.
a) Find the LMTD (answer: 16.5).
b) Find the tube length needed for the heat transfer (answer: 5.1 m).

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