The viscosities of several liquids are being compared. all the liquids are poured down a slope with equal path lengths. the liquid with the highest viscosity will reach the bottom first reach the bottom last

The answer is:

The liquid with the highest viscosity will reach the bottom last.

The explanation:

when the viscosity is the measurement of the liquid to flow and measure its internal friction, as the liquid with high viscosity has its molecular structure gives it a high internal friction when it is moving, so it moves slowly. but the liquid with a lower viscosity has its molecular structure gives it a low internal friction and its resistance to the surface which pass on it is being lower, so it's flow faster on the surface.

for example the movement of honey and the movement of water of course the movement of water is faster than the flow of the honey . as the honey has high viscosity , but water has low viscosity.