Best Angle of Climb Speed (VX) is found at the maximum excess of Thrust - in other words, where the gap between the Thrust available and Thrust Required "Drag" curves is the greatest.
For a Jet - VX is the same IAS as VMD
For a Prop - VX is slower than VMD (close to VMP)
Best Rate of Climb Speed (VY) is found at the greatest excess of Power over Power Required.
For a Jet - VY corresponds to 1.32 VMD
For a Prop - VY is the same IAS as VMD
During a climb, VX is normally always less than VY. However, as altitude increases the power required curve moves up and to the right, since the power available decreases and the power required increases. As a result, the value of VX increases until the absolute ceiling where these speeds meet at the same value VX = VY. The correct option should state that VX is always lower or equal to VY, but this option is not available.
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