Question

A car travels a distance of 75km at the speed of 25km/hr .it covers the next 25km of its journey at the speed of 5 km/hr and the last 50 km of its journey at the speed of 25 km/hr .what is the average speed of the car

Answer 1

Answer:

15 km/h

Explanation:

Car travels 75 km at speed of 25 km/h

So time taken to cover 75 km=75/25

=3 hours

Next it covers 25 km at speed of 5 km/h

So time taken to cover 25km=25/5

=5 hours

And last it covers 50 km at speed of 25 km/h

Time taken=50/25

=2 hours

Total distance=75km+25km+50km

=150 km

Total Time taken=3hr+5hr+2hr

=10 hr

Average Speed

$average \: speed = \frac{total \: diatance}{total \: time}$

$\: = \frac{150}{10}$

=15 km/h

___________

Thus,Average speed of the car=15 km/h

Answer 2

$\mathfrak{\large{\underline{\underline{Answer:-}}}}$

The average speed of the car is 15km/h.

$\mathfrak{\large{\underline{\underline{Explanation:-}}}}$

Given that :

A car travels a distance of 75km at the speed of 25km/hr.

So,

Car travels 75 km at speed of 25 km/h

Time taken to cover 75 km :

=> $\dfrac{75}{25}$

=> 3 hours

Next it covers 25 km at speed of 5 km/h

Time taken to cover 25km

=> $\dfrac{25}{5}$

=> 5 hours

And last it covers 50 km at speed of 25 km/h

Time taken :

=> $\dfrac{50}{25}$

=> 2 hours

Total distance :

=> 75km + 25km + 50km

=> 150 km

Total Time taken :

=> 3 hr + 5hr + 2hr

=> 10 hr

Now,

We know that :

★ $\boxed{\sf\;Average\;Speed = \dfrac{Total\;Distance}{Total\;Time} }$

Put the given values :

$\sf=>\dfrac{150}{10}\\\\\sf =>15 km/h$

Hence,

Average speed of the car = 15 km/h.