[Tin tức] A car covers four successive 7 km distances at speeds of 10km/hour, 20 km/hour, 30km/hour and 60…

A car covers four successive 7 km distances at speeds of 10km/hour, 20 km/hour, 30km/hour and 60km/hour respectively. Its average speed over this distance is
Class: 14
Subject: MATHS
Chapter: TIME AND DISTANCE
Board:GOVT

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