Meera covers a distance of 18 km at 9 km/hr, a distance of 24 km at 8 km/hr, and a distance of 16 km at 4 km/hr. What is her average speed?
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time in first part=18/9=2hrs
time in second part=24/8=3hrs
time in 3rd part=16/4=4hrs
total distance=18+24+16=58
total time=9hrs
avg speed=total d/total t=58/9 km/h
hope it helps
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