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39. Multiple choice question XXXIX

A body goes from \(A\) to \(B\) with a velocity of \(20\ ms^{-1}\) and comes back B to A with a velocity of \(30\ ms^{-1}\). The average speed of the body during the whole journey is

\(zero\)
\(24\ ms^{-1}\)
\(25\ ms^{-1}\)
\(30\ ms^{-1}\)

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