Question

A car cover first half of the total distance with speed 36km/h and second half with speed of 54km/h per hour find the average speed of the car

Answer 1

ans is 45 km per h is the average speed

Answer 2

Answer:

Their average speed is 43.2 km/hr.

Step-by-step explanation:

Given : A car cover first half of the total distance with speed 36 km/h and second half with speed of 54 km/h per hour.

To find : The average speed of the car?

Solution :

Let the distance covered in first half be x.

So second half distance will also be x.

We know, $\text{Time}=\frac{\text{Distance}}{\text{Speed}}$

Time at first half is

$t_1=\frac{x}{36}$

Time at second half is

$t_2=\frac{x}{54}$

Average speed of the car is,

$\text{Average Speed}=\frac{\text{Distance}}{\text{Tiime}}$

$\text{Average Speed}=\frac{2x}{\frac{3x+2x}{108}}$

$\text{Average Speed}=\frac{2x\times 108}{5x}$

$\text{Average Speed}=\frac{2\times 108}{5}$

$\text{Average Speed}=43.2$

Therefore, Their average speed is 43.2 km/hr.