A man travels one third length of a straight road with a constant speed of 40 m/sec. and the remaining portion of the road with a constant speed of 60 m/sec, then calculate its average speed.
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A man travels one third length of a straight road with a constant speed of $40{m} / {sec}$. and the remaining portion of the road with a constant speed of $60 {m} / {sec}$., then calculate its average speed.

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ANSWER : The average speed will be $51.4 {m} / {sec}$.

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