A car moves with a speed of 30km/h for half an hour, 25km/h for one hour and 40km/h for two hours, calculate the average speed of the car
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Answer:
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.
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Distance covered in half an hr at 30km/hr=
s×t = 30 × 1/2 = 15km
Distance covered in 1 hr at 25km/h=
s×t = 25 × 1 = 25km
Distance covered in 2 hr at 40 km/hr=
s×t = 40 × 2 =80km
Therefore, Total Distance covered=
15+25+80 = 120km
Total Time taken = 3 hrs and 30 minutes = 7/2hrs
Therefore, average speed = Total Distance covered/Total Time Taken = 120 × 2/7 = 34.28km/hr
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