Question

3. Two Cars, A and B, (starting, at the same time, from the same point) are moving with average speeds of 40 km/h and 50 km/h, respectively, in the same direction. Find how far will Car B be from Car A after 3 hours. ​

Answer 1

Answer:

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Answer 2

Given:

Average speed of car A= 40km/h

Average speed of car B= 50km/h

Total time= 3 hours

To Find:

The distance between car A and car B at the end of 3 hours.

Solution:

This numerical problem can be solved by using the following process.

Now,

Speed of A ($v_{A}$)= 40km/h

Speed of B ($v_{B}$)= 50km/h

Time= 3 hours

Distance ($d$) between A and B=?

To find this, we first have to determine the distance traveled by both A and B.

As the expression for speed of a body is $v=\frac{d}{t}$ ;

Distance traveled will be $d=v . t$

Then,

$d_{A}$= 40km/h x 3h= 120km

$d_{B}$= 50km/h x 3h= 150km

We can now find the distance between A and B.

$d_{AB}= d_{B}-d_{A}$= 150km - 120km

$d_{AB}$ = 30km

Hence, car B will be 30km ahead of car A after 3 hours.