Important notes and formula

If a car travels D distance in time T then we say the speed of the car is S and we express the speed in terms of distance and time as follows.

Speed = | Distance |

Time |

Distance = Speed x Time

Time = | Distance |

Speed |

Speed is expressed as distance per unit time. Most commonly used unit for speed are

meter per second (m/s)

kilometer per hour (km/hr)

We know 1 km = 1000 m and 1 hour = 3600 seconds.

Therefore,

1 km/hr = | 1000 | m/s |

3600 |

1 km/hr = | 5 | m/s |

18 |

We know 1000 m = 1 km and 3600 seconds = 1 hour.

Therefore,

1 m/s = | 18 | km/hr |

5 |

If the speed of two trains are in the ratio X:Y then time taken by them to cover the same distance is Y:X

If a car covers a certain distance at a speed X km/hr and then covers an equal distance at Y km/hr then the average speed of the car for the complete journey is

Avg. Speed = | 2XY |

X+Y |

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