Geography Quiz / Busiest Metro Systems by Continent

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Which cities have the busiest Metro Systems?

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Score 0/20 Timer 03:00
Asia
3660 million 
3401 million 
2620 million 
2568 million 
2497 million 
Europe
2385 million 
1526 million 
1340 million 
742 million 
570 million 
North America
1763 million 
1624 million 
354 million 
303 million 
239 million 
South America
1316 million 
668 million 
495 million 
242 million 
228 million 

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