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OpenStudy (anonymous):
a car travels along a straight line for first half time with speed 40km/h and the second half time with speed 60km/h.find the average speed of car
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OpenStudy (neer2890):
240/5=48 km/hr
OpenStudy (neer2890):
Average speed= total distance covered / total time taken so, avg speed=\[\frac{ D/2+D/2 }{ D/2*40 +D/2*60}=240/5=48\]
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