a man covers first 120 km of his journey at 40km/h, next 145 km at 58 km/h and last 35km in half an hour. find his average speed during the whole journey?
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120 + 145 + 35 /(3+2.5+.5)
=300/6 =50km/hr is average
=300/6 =50km/hr is average
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