On a 60km track travels the first 30km with a uniform speed of 30km/h. – McqOptions

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1.	On a 60km track travels the first 30km with a uniform speed of 30km/h. How fast must the train travel the next 30km so as to average 40km.h for the entire trip?
A.	60km.h
B.	90km/h
C.	120km/h
D.	30km/h
Answer» B. 90km/h

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