1) Starting at t=0 with 1 pair of roaches, how long will it take until the mass of the total roach population exceeds the mass of the top 2 meters of Earth's land surface? (let the mass of a roach equal 1 gram, density of Earth's top surface equal 2 $gcm^{-3}$, the amount of land surface equal about 25% and the radius of Earth equals 6,378km).