Question

a car travels 30km at a uniform speed of 40km and next 30km at uniform speed of 20km ? find the average speed​

Answer 1

hope it's helpful.this is ur answer

Answer 2

To Find

We have to find the average speed

Given:-

A car travels 30km at a uniform speed of 40km

Next,30km at uniform speed of 20km

Solution:-

Answer:

26.67 km/hrs

step-by-step explanation:

We know that ,

Speed = Distance / Time

Therefore, Time = Distance / speed

Now, The first case

Here,

Distance = 30 km

Speed = 40km/hr

Then,

$Time = \dfrac{distance}{speed}$

$Time = \dfrac{30}{40}$

Time = 3/4 hrs.

Now, The second case

Distance = 30 km

Speed = 20 km/hr

$Time = \dfrac{30}{20}$

Time = 3/2 hrs

Now, We know that

$Average Speed = \dfrac{Total Distance }{Total Speed}$

= ( 30 + 30 ) / ( 3/4 ) / ( 3/2 )

= ( 30 + 30 ) / 2.25

= 60 / 2.25

= 26.66667 ( approx )

Required Answer

So,The average speed is 26.67 km/hr

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Some important concepts

Density = Mass / Volume

Volume of Cube = ( side )³

Volume of cuboid = length×breadth×height

Volume of Cylinder = π ( radius )² × height

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