A car travels 30 km at a uniform speed of 40 km/h and the next 30 km at a
uniform speed of 20 km/h. Find its average speed.
Answers
Answer:
uf uf uf I will show you i i I have also shown in fig
Explanation:
It is given that a car travels 30
km at the uniform speed of 40
km/hr and next 30
km at the speed of 20
km/hr.
We have to find the average speed of the car.
Before finding the average speed, we will find the time taken by the car to cover the given distance.
We know the relation between distance speed and time is given by the formula
Distance=speed×time.
From this relation the time is being calculated using the following formula,
time=distancespeed
.
So, the time required by the car to cover 30
km at the uniform speed of 40
km/hr is =3040
hours.
Again, the time required to cover the last 30
km at the uniform speed of 20
km/hr is =3020
hours.
So, from the found time we will calculate the total time,
The total time taken by the car is =3040+3020
hours
Let us simplify the above equation so that we get, the required time as 94
hours
Total distance is =30+30=60
km
From the relation Distance=speed×time.
we can say that
speed=distancetime
But substituting the known values we find the average speed,
The average speed is =6094
km/h
By simplifying the above term we get, the average speed is =26.67
km/h
Hence, the average speed of the car is =26.67
km/h