A car travels between two towns. After 1 hour the driver has travelled 120km. She then stops and rests for 1 hour. She takes another 1 hour to travel a further 60 km to reach her destination.
What is the average speed of the car for the whole journey?

60 km / h
2 )
90 km / h
3 )
120 km / h
4 )
180 km / h
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