Answer
$51\text{ torr}$
Work Step by Step
The actual vapor pressure equals the product between the relative humidity and the saturation vapor pressure of water at $40^\circ\text{C}$ (which is $55.3\text{ mmHg}$):
$0.92\times 55.3\text{ mmHg}\approx 50.88\text{ mmHg}\approx 51\text{ torr}$
