Basics of Time, Speed and Distance

In this module we will learn about the basic concepts of Time, Speed and Distance.

Time, Speed and Distance Formula

Speed - distance covered by a moving object in unit time.

So, Speed = $\frac{D i s t a n c e}{T i m e}$

Or we can write the above formula as follows:

Distance = Speed × Time

Explanation:

We know that:

Speed = $\frac{D i s t a n c e}{T i m e}$ = $\frac{20}{5}$ = 4 km/hour

It means that the person travels 4 km in one hour.

Conversion of units of speeds:

(You can drive the above values if you put 1 km = 1000 m and 1 hour = 3600 seconds)

Every 18 kmph corresponds to 5 m/s.
Thus 36 kmph = 10 m/s, 54 kmph = 15 m/s and 72 kmph = 20 m/s.

Explanations :

Explanation 1:

Time = 10 minutes = 10 × 60 = 600 seconds

Speed = $\frac{D i s t a n c e}{T i m e}$ = $\frac{1200}{600}$ = 2 m/sec

x m/sec = x × $\frac{18}{5}$ = $\frac{18 x}{5}$ km/hr = $\frac{36}{5}$ km/hr = 7.2 km/hr

Explanation 2:

Time = 10 minutes = 10 / 60 = 1/6 hour

Distance = 1200 metre = $\frac{1200}{1000}$ = 1.2 km

Speed = $\frac{D i s t a n c e}{T i m e}$ = $\frac{1.2}{(1 / 6)}$ = 7.2 km/hr

Formula for finding out the number of revolutions:

Distance, D = Circumference × n = 2πrn

Where, n = number of revolutions and r = Radius of circle

Formula for finding the distance based on the count of the number of poles (e.g. when you are travelling in a train):

Total distance = (n - 1)x

Where, n = number of poles and x = Distance between consecutive poles.

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Last updated on Feb 18, 2021