Question

A taxi driver noted the reading on the odometer fitted in the vehicle as 1052 km when he started the journey. After 30 mins drive, he noted that the odometer reading was 1088 km. Find its average speed.

Answer 1

Answer:

Given:

Initial odometer reading = 1052 km

Final odometer reading = 1088 km

Time between these reading = 30 min

To find:

Average speed of the car

Concept:

Average speed is universally defined aa the ratio of total distance to the total time taken to travel that distance.

Since the term "distance" is involved , we can say that "average speed " is a scalar quantity . If only has magnitude ans no Direction. And it is always positive.

Calculation:

Distance travelled in the specified time Interval be d.

$d = final \: reading - initial \: reading$

$= > d = 1088 - 1052$

$= > d = 36 \: km$

Now time taken should be considered in hours :

$t = 30 \: min = \dfrac{1}{2} \: hr$

Now average speed :

$avg. \: v = \dfrac{d}{t}$

$= > avg. \: v = \dfrac{36}{ \{\dfrac{1}{2} \}} = 72 \: km {hr}^{ - 1}$

So final answer :

$\boxed{ \red{ \bold{ \sf{ \huge{avg. \: v = 72 \: km {hr}^{ - 1} }}}}}$

Answer 2

$</p><p>\tt{\huge{\pink{Hello!!! }}}$

$</p><p>\tt{\red{Given \: - }}$

$</p><p>\tt{\blue{D_{1} = 1052 \: km. }}$

$</p><p>\tt{\blue{D_{2} = 1088 \: km. }}$

$</p><p>\tt{\purple{\implies{{\delta} D= 36 \: km. }}}$

$</p><p>\tt{\green{Time = 1/2 \: hr. }}$

$</p><p>\tt{\red{\implies{Average \:Speed = 72 \:kmph. }}}$