### Rating TOP 10

# |
Name |
Points |

1 |
profdemath |
7 |

2 |
mathematik |
3 |

3 |
alex2311 |
1 |

4 |
unamed |
0 |

5 |
nicopro |
0 |

6 |
jul |
0 |

7 |
nayka2000 |
0 |

8 |
JohnnokoV |
0 |

9 |
user123 |
0 |

10 |
Allenfiche |
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?