Two third part of which planet is covered with water?

Q. A body covers one third of the distance with speed $V_1$ and two third of the distance with speed $V_2$. The average speed of the body is:

Q. Name the planet which is third from the Earth.

Q. What part of earth is covered with water ?

Q. Kepler's third law helps us in finding

Q. How much of the earth's surface is covered with water?

(a) about two-thirds
(b) about three-fourths
(c) exactly three-fourths
(d) about one-fourth