Question

A car covers a distance of 500 km at a speed of 50 km/h and then its speed increased to 60 kmph to cover another 630 kmph.what is the avg speed of car

Answer 1

first 500 km covered in 10 hr. next 630 km covered in 10.5 hr. total 1130 km covered in 20.5 hr. av speed 1130/20.5. 55.122 kmph

Answer 2

Answer:

The average speed of the car is 55.122 km/h.

Explanation:

Given that,

Distance $d_{1}= 500 km$

Speed $v_{1}=50\ km/h$

Increased speed$v_{2}=60\ km/h$

Distance $d_{2}=630\ km$

We know that,

The distance if the car is the product of the speed and time.

So, for times t₁

$t_{1}= \dfrac{d_{1}}{v_{1}}$

$t_{1}= \dfrac{500}{50}$

$t_{1}= 10\ h$

For time t₂

$t_{2}=\dfrac{630}{60}$

$t_{2}= 10.5\ h$

The average speed is defined as:

$v_{avg}=\dfrac{D}{T}$

Here, D = total distance

T = total time

$v_{avg}=\dfrac{500+630}{10+10.5}$

$v_{avg}=\dfrac{1130}{20.5}$

$v_{avg}=55.122\ km/h$

Hence, The average speed of the car is 55.122 km/h.