Q10. A car moves with a speed of 30 km/h- for half an hour, 25 km/h-+ for one hour and 40 km/h
1 for two hours. Calculate the average speed of the car.
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Distance covered in half an hour at 30km/hr = s×t = 30×1/2=15km. Distance coveted in 1hr at 25km/hr= s×t= 25×1 =25km. Total time taken= 3hrs and 30 mins=7/2 hrs. Therefore, average speed=total distance covered/total time taken = 120×2/7 = 34.28km/hr.
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