1. A truck covers 40 km with an average speed of 80 km/h. Then it travels another 40 km with an average speed of 40 km/h. The average speed of the truck for the total distanced covered is: a]40 km/h b]45 km/h c]48 km/h d]53 km/h
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(80+40)/2
=120/2
60km/h
=120/2
60km/h
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