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120 metres

180 metres

324 metres

150 metres

D. 150 metres

$Speed=\left(60x\frac{5}{18}\right)m/sec=\left(\frac{50}{3}\right)m/sec.\phantom{\rule{0ex}{0ex}}Lengthofthetrain=(SpeedxTime)=\left(\frac{50}{3}x9\right)m\phantom{\rule{0ex}{0ex}}=150m.$