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A train moving at a constant velocity of 54 km/hr moves east wards for 30 minutes, then due north with the same speed for 40 minutes. What is the average velocity of the train during this run? (in km/hr)

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38.6

49.3

answer is C.

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Detailed Solution

$V_{avg} = \frac{total displacement (s)}{total time (t)} = \frac{45 \times 60}{70} = 38.6 km / hr$

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