Need An Account? Sign Up Now

### Rating TOP 10

# | Name | Points |
---|---|---|

1 | profdemath | 7 |

2 | mathematik | 3 |

3 | alex2311 | 1 |

4 | Player | 0 |

5 | nicopro | 0 |

6 | unamed | 0 |

7 | Nikita | 0 |

8 | jul | 0 |

9 | Rodrick_Grady | 0 |

10 | user123 | 0 |

#### Register and become the new leader !

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?