Robert traveled a distance of 30 km, covering the first 10 km in x minutes, the next 10 km in y minutes and the last 10 km in z minutes. If he totally took 3y minutes to cover the whole distance, then which of the following cannot be true? Assume x , y and z are different.

A. z=3x

B. x=3z

C. y=2x

D. x=2y

E. y=3x

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Srinivasan Vaidyaraman

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