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# Name Points
1 profdemath 7
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Recent problems :
(All problems are in the Training section)

  • Two trains of length 300m and 250m are moving. Each train has a speed of 85 km per hour and moving in the opposite direction. How long will it take for them to pass each other?
  • A plane flies horizontally with a speed V=470 m/s. A man hears the noise of the plane 21 seconds after the passage of the plane above him. From what height flies the plane? Speed of sound: C = 330 m/s.
  • An object falls freely of a height h=490 meters. What distance is it going to fall during the last 2 seconds of fall?