Question

3. A car travels 40 km in the first hot 45 km in the second hour and 35 km in the third ho
Calculate the average speed of the vehicle in km/h and m/s.
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Answer 1

Explanation:

average speed =80/3=26.6 OK friend

Answer 2

Answer:

If a car travels the first half of a distance at 40 km/hr and the second half in 60 km/hr, then what is the average speed of the car?

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Average speed is total distance travelled divided by total time taken.

Let the distance travelled is 2x or half of distance is x.

The first half of distance x is travelled with speed of 40km/hr , so time taken is x/40hr.

Similarly time taken to travel remaining x km is at speed of 60km/hr, so time taken for this 2nd half of distance is x/60.

Now, total time taken to travel 2x distance is x/40+x/60 hr or 3x/120+2x/120hr or 5x/120 hr or x/24 hr.

The average speed of car is 2x/x/24 or 2*24 km/hr or 48km/hr.