Tag: general knowledge

A cyclist drove one kilometer, with the wind in his back, in three minutes and drove the same way back, against the wind in four minutes.If we assume that the cyclist always puts constant force on the pedals, how much time would it take him to drive one kilometer without wind?

You walk upwards on an escalator, with a speed of 1 step per second.After 50 steps you are at the end.You turn around and run downwards with a speed of 5 steps per second.After 125 steps you are back at the beginning of the escalator.How many steps do you need if the escalator stands still?

This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel. Who is he?