A car driver sets out from home to travel to Cambridge. After 1 hour he is 40 km from home. He discovers that he must return home to collect his briefcase. This journey also takes him 1 hour. He sets off again immediately. He reaches Cambridge, 100 km from home, 2 hours later.
What is the average speed for the whole of his journey from leaving home the first time?
1 )
25 km / h
45 km / h
3 )
50 km / h
4 )
90 km / h
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