1.

car moves with a speed of 30 km/Mr for half an hour, 25 km/h' for one hour and 40 km/h for two hours. Calculate average speed of the car

Answer» \huge\boxed{Answer}-------

In the first case , the car travels at a speed of 30km/hr for a time of 0.5 hour.

Now, Speed = \frac{<klux>DISTANCE</klux>}{Time}

So ,

30 =\frac{distance}{0.5}

Therefore,

Distance

= 30 × 0.5

= 15km ..............(1)

In the second case , the car travels at a speed of 25km/hr for a time of 1 hour.

Since, Speed = \frac{Distance}{Time}

So ,

25 = \frac{distance}{1}

Therefore,

Distance

= 25 × 1

= 25km .............(2)

In the THIRD case , the car travels at a speed of 40km/hr for a time of 2 hours.

Since ,

Speed = \frac{Distance}{Time}

So,

40 = \frac{distance}{2}

Therefore,

Distance

= 40 × 2

= 80km ...........(3)

By combining EQUATIONS, (1),(2), and (3) , we get ...

Total Distance covered = 15 + 25 + 80
= 120 km.

Total time taken = 0.5 + 1 + 2
= 3.5 hours.

Therefore,

Average speed =

\frac{Total\:distance\:travelled}{Total\:time\:taken}

= \frac{120}{3.5}

= 34.28

Therefore ,
Average Speed = 34.28km/hr.

\huge\mathcal{Be\:Brainly}


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