# A cat moves from 𝑋 to 𝑌 with a uniform speed 𝑣𝑢and returns to X with a uniform speed 𝑣𝑑. The average speed for this ground trip is

Question : A cat moves from 𝑋 to 𝑌 with a uniform speed 𝑣𝑢and returns to X with a uniform speed 𝑣𝑑. The average speed for this ground trip is

(A) $-\dfrac{2v_{d}v_{v}}{v_{d}+v_{u}}$

(B) $\sqrt{V_{u}V_{d}}$

(C) $\dfrac{v_{d}v_{u}}{v_{d}+v_{u}}$

(D) $\dfrac{v_{u}+v_{a}}{2}$