Mind-Stretching Math Puzzles

Derrick Niederman, one of Sterling's most popular puzzle authors, has come up with another collection of super-tricky math brainteasers that's great for home or the classroom. Hours of mind-bending, brain-stretching fun await solvers, who can warm up with easy problems like this, before moving on to harder and harder conundrums:Hector can run from the train station to his parents' house in eight minutes. His younger brother Darius can run the same distance eight times in one hour. Who is faster?