Question

A car covers half distance with speed 20km/hr and other half with 60 km/hr.
What is the average speed

Answer 1

Answer:

Explanation:

simply,

average speed= total speed/total no. of speed given

=20+60/2

=80/2

=40 km/h

So,

average speed=40km/h

Hope,it helps you.........................

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Answer 2

Average speed of the car will be 30 km/hr

Explanation:

Let the total distance is 2d

It is given that car covers half of the distance with 20 km/hr

So time taken to cover half of the distance $t_1=\frac{d}{20}hour$

Now half of the distance with a speed of 60 km/hr

So time taken $t_2=\frac{d}{60}hour$

Total time taken $t=t_1+t_2=\frac{d}{20}+\frac{d}{60}=\frac{4d}{60}=\frac{d}{15}hour$

We know that average speed $=\frac{total\ distance}{total\ time}=\frac{2d}{\frac{d}{15}}=30km/hr$

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