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A computer is infected with the Sasser virus. Assume that it infects 20 other computers within 5 minutes; and that these PCs and servers each infect 20 more machines within another five minutes, etc. How long until 100 million computers are infected?

A child in an airport is able to cover 392 meters in 4 minutes running at a steady speed down a moving sidewalk in the direction of the sidewalk's motion. Running at the same speed in the direction opposite to the sidewalk's movement, the child is able to cover 204...

Two rainstorms occurred in one week in a certain area. In the first rainstorm 15 ml of rain fell per hour, and in the second rainstorm 25 ml of rain fell per hour. Rain fell that week for a total of 50 hours for a total rainfall of 950 ml. How long was each of the two...