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It weighs 300 kilograms. That's 660 pounds for Americans.
300000 sq miles is equivalent to the size of the state of Texas.
300000 kps likely refers to 300,000 kilometers per second, which is an extremely high speed that is faster than the speed of light. This speed is not achievable with our current technology or understanding of physics.
After t hours the number of bacteria is 10*2t. So 10*2t > 3000000 => 2t > 300000 => t(log2) > log(300000) => t > log(300000)/(log2) => t > 18.19.. So in just over 18 hours (or 18 hours and 12 minutes, approx).
3,000 feet is 0.9144 kilometers.