A car traveled 30 km in 1 hour, 40 km in the next 1 hour, and then 30 km in 2 hours before reaching its destination. What was the car's average speed?
A car traveled 30 km in 1 hour, 40 km in the next 1 hour, and then 30 km in 2 hours before reaching its destination. What was the car's average speed?
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