Question

A car travel 30km at a uniform speed of 40km/hr. and a next 30km at a uniform speed of 20km/hr. fine a average speed​

Answer 1

$\huge\underline\bold\pink{Solution:-}$

Given:-

A car travels 30 km at the uniform speed of 40 km/h and next 30 km at the speed of 20 km/h.

To Find:-

The Average Speed of the Car.

Solution:-

First we have to find the time taken by the car to cover the given distance.

Formula:-

Distance = Speed × Time

So, from this formula we can find the Time as :-

Time = $\frac{Distance}{Speed}$

Now,

Time required to cover 30 km at the uniform speed of 40km/hr = $\dfrac{30}{40}$hrs.

Again,

Time required to cover 30 km at the uniform speed of 20km/hr = $\dfrac{30}{20}$hrs.

$\implies$ $\dfrac{30}{40}$+$\dfrac{30}{20}$=$\dfrac{9}{4}$hrs.

The total time taken by the Car = 30+30= 60km

Now,

Speed =$\frac{Distance}{Time}$

$\therefore$ The average Speed = $\dfrac{60}{90}$$\div$$\dfrac{1}{4}$km/h. = 26.67 km/h.

Hence, Average Speed of the Car = 26.67km/h

Answer 2

Answer:

A car travel 30km at a uniform speed of 40km/hr. and a next 30km at a uniform speed of 20km/hr. fine a average speed

your answer in attachment