The concept of

**time, speed and distance** is one of
the most important concepts of Algebra and Arithmetic. It is
advised to keep yourself prepared to see a question or two from
this topic.

**This Topic covers following
concepts:**
**-Relationship between time, speed and distance**
**-Important formulae to solve the related
problems**
**-Average speed and relative speed**

**TIME:** TIME is a component to compare the

**durations
of events** and the

**intervals** between them,
and to quantify the motions of objects.

**SPEED:** The speed of a
body can be defined as the

**distance covered by it in Unit
time**. This statement gives birth to three forumlae.

**DISTANCE:** The numerical
description of

**"How far two objects are"** is called
distance. It may also refer to the length between two points that
may be present or may get created.

**1)**
; Distance is constant%

**This also proves SPEED IS
PROPORTIONATE WITH .**

If you notice the distance traveled in a unit time with different
speed, greater the speed in a time unit; greater will be the
distance covered under that time span.

**Example:** Mr. X uses his car to go to office
which is 50 km from his place.

It takes him 1 hour to reach office if he travels at usual speed of
{}

Suppose, Mr. X on a particular day managed to reach office in

We can say that he drove at a higher speed as the distance was
constant, 50 km(home to office).

In this case the speed will be

**2)**

; Time is constant

Thus, **DISTANCE IS PROPORTIONATE TO SPEED**.

**Example:** Time taken in a particular journey can be
changed only in two cases.

**Case-1: Change in speed of object -**

**Case-2: Change in distance covered -**

**3)**

; Speed is constant

Thus, **DISTANCE IS PROPORTIONATE TO TIME**.

**UNITS OF MEASUREMENT:** |

**TIME can be measured
in:** |

Hours |

Minutes |

Seconds |

**Some conversions related to TIME are as follows:** |

1 Hour = 60 Minutes = 60 X (60 Seconds) = 3600 Seconds |

**DISTANCE can be measured in
various units. some important are:** |

Miles |

Kilometers |

Meters |

Yards |

Feet |

**Some conversions related to DISTANCE are as follows:** |

1 Kilometer = 1000 Meters |

1 Kilometer = 0.6214 Miles
=1 Mile = 1.609 Kilometer
= 8 Kilometer = 5 Miles |

1 Yard = 3 feet |

**SPEED IS MEASURED IN TERMS OF
DISTANCE COVERED / TIME.
SOME IMPORTANT
UNITS ARE:** |

Miles/hour |

Kilometers/hour |

Meters/second |

**Some conversions related to SPEED are as follows:** |

To convert kilometer per hour to meter per second: |

To convert meters per second to Kilometer to hour: |

To convert kilometer per hour to miles per hour: |

To convert miles per hour to feet per second: |

**
P.T.O.**

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