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7. A car moves through 20 km at a speed of 40 km/h,and the next 20 km at a speed of 60 km/h. Calculateits average speed |
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Answer» Answer: 48kmph Explanation: 1st CASE: d= 20km s1= 40kmph 2nd case: d=20km s2= 60kmph for EQUAL distance... Avg.speed= 2/((1/s1)+(1/s2)) = 2/((1/40)+(1/60)) =(2*120)/5 =240/5 =48 KMPH |
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