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Measurement (length) - class-V
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A train $280 m$ long, running with a speed of 63$\mathrm { km } /$ hr will pass a tree in
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A
$16 sec$
💡 Explanation:
$Speed\>of\>train\>=\>63(\dfrac{Km}{hr})\\=(\dfrac{63\cdot100m}{3600s})\\=17.5(\dfrac{m}{s})\\By\>passing\>a\>tree,\>train\>will\>have\>to\>cross\>its\>own\>length\\\therefore\>Time\>taken\>=\>(\dfrac{280}{17.5})=16sec$