A train travels first 400 kms at an average rate of 80 kmph and further travels

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โœช Choose the correct option.

A train travels first 400 kms at an average rate of 80 kmph and further travels the same distance at an average rate of 60 kmph. Determine the average speed of the train over the whole journey.

A. 68.57 kmph
B. 74 kmph
C. 72.84 kmph
D. 70 kmph

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