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
3778 million 
3538 million 
2857 million 
2800 million 
2642 million 
Europe
2442 million 
1519 million 
1378 million 
740 million 
626 million 
North America
1727 million 
1605 million 
368 million 
304 million 
230 million 
South America
1309 million 
670 million 
495 million 
303 million 
241 million 

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