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Maria's average speed for a 6 hour trip was 40kph. For the first 4 hours, she drove at an average rate of 50kph. What was her average speed for the last 2 hours?

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let her speed for the last two hours be x km/h

total distance = 6(40) = 240 km

4(50) + 2(x) = 240
2x = 40
x = 20

speed of last part = 20 km/h

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