A car runs at speed of 60 k/h over 50 km; the next 30 km at speed of 40 k/h; next 20 km at speed of 30 k/h; final 50 km at speed of 25 k/h. What is the average speed?
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Step-by-step explanation:
avg speed= total distance/total time
50/60=5/6
30/40=3/4
20/30=2/3
50/25=2
17/4 hours
150/17/4= 600/17 kmph
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