Question

On a 120 km track, a train travels the first 30 km with a uniform speed of 30 km/h. How fast must the train travel the next 90 km so as to average 60 km/h for the entire trip?

A .

65 km/h

B .

90 km/h

C .

120 km/h

D .

100 km/h


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Answer 1

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option (b) is right