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42. Multiple choice question XXXXII

A train has a speed of \(60\ \frac{km}{hr}\) for the first one hour and \(40\ \frac{km}{hr}\) for the next \(half\ hour\). Its average speed in \(\frac{km}{hr}\) is

\(50\ \frac{km}{hr}\)
\(53.3\ \frac{km}{hr}\)
\(48\ \frac{km}{hr}\)
\(70\ \frac{km}{hr}\)

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