a person covers 12km at 3km/h 18km at 9km/h and 24km at 4km/h. find the average speed
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time taken to travel 12km = 12÷3 = 4h
time taken to travel 18km = 18÷9 = 2h
time taken to travel 24km = 24÷4 = 6h
average speed = (12+18+24)/(4+2+6)
= 4.5 km/h
time taken to travel 18km = 18÷9 = 2h
time taken to travel 24km = 24÷4 = 6h
average speed = (12+18+24)/(4+2+6)
= 4.5 km/h
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