Mark IV writes:

Question: What is the difference between best rate of climb speed and
best angle of climb speed?



Answer: The best rate of climb speed, also known as VY, provides the
greatest gain in altitude in the least amount of time. The best angle
of climb speed (also known as VX) provides the greatest gain in
altitude over a given horizontal distance.

Quibble: I would change the first to:

The best rate of climb speed, also known as VY, provides the
greatest gain in altitude in a unit time (or given time).
--
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