A train has a speed of \( 60 \mathrm{~km} / \mathrm{h} \) for the first one hour and \( 40 \math...

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A train has a speed of \( 60 \mathrm{~km} / \mathrm{h} \) for the first one hour and \( 40 \mathrm{~km} / \mathrm{h} \) for the next half hour. Its average speed in \( \mathrm{km} / \mathrm{h} \) is
[JIPMER 1999]
(a) 50
(b) \( 53.33 \)
(c) 48
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