Question

A car moves with the speed of 30 km/h for half an hour, 25km/h for one hour and 40km/h for two hours. .calculate the average speed of the car

Answer 1

heya!!

we know,



Distance = Speed × time


Average speed = Total distance travelled ÷ Total time taken


refer to given attachment please

Answer 2

Hope u like my process
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Formula to be used:
Distance (D) = speed ×time
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For first half an hour,

The car travels = D1 = 30 ×½ =15 km

For next 1 hour,

The car travels = D2 = 25×1 = 25km

For next 2 hours,

The car travels = D3= 40×2 =80 km.
.
So total distance travelled =D1 +D2 +D3 = 15+25+80=120km

Total time taken = ½ +1 +2 =3 +0.5 =3.5 hr

So,..
Average speed = total distance /total time
= 120/3.5 ≈34.286 km/hr

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