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A boat travelled a total distance of 40 km. During the first hour, it travelled at an average speed of 10 km/hr. During the last

A boat travelled a total distance of 40 km. During the first hour, it travelled at an average speed of 10 km/hr. During the last hour, it travelled at an average speed of 30 km/hr. What was its average speed over the total distance of 40 km? Multiple Choice 15 km/hr 18 km/hr 20 km/hr

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