Question

A car travels 40 km in 20 mins .find the speed in km /hr

Answer 1

speed = distance / time

= 40/20

= 2 km/ min

2 x60

= 120 km/ hr

Answer 2

Given:

Distance travelled by car,d= 40 km

Time taken by car,t= 20 mins

To Find:

Speed of car in km/h

Solution:

We know that,

• $\red{\underline{\boxed{\bf{Speed=\frac{Distance}{Time}}}}}$

$\rule{190}{1}$

It is given that,

$\longrightarrow\rm{t=20\ h=\dfrac{20}{60}\ h=\dfrac{1}{3}\ h}$

$\rule{190}{1}$

Let the speed of car be S

So,

$\longrightarrow\rm{S=\dfrac{d}{t}}$

$\longrightarrow\rm{S=\dfrac{40}{\dfrac{1}{3}}}$

$\longrightarrow\rm{S=40\times3}$

$\longrightarrow\rm\green{S=120\ km/h}$

Hence, the speed of car is 120 km/h.

$\rule{190}{1}$

Additional Information

Speed

The distance covered by moving body in unit time is called speed of the body.

Average Speed

Average speed is defined as the ratio of total distance covered and total time taken.

$\green{\boxed{\bf{Average\ Speed=\frac{Total\ Distance\ covered}{Total\ Time\ Taken}}}}$