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A train 20 m long is moving with a speed...

A train 20 m long is moving with a speed of 40 km/h. In what time shall it cross a bridge of 500 m long?

Text Solution

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Length of the train `S_(1)=20m`
Length of the bridge `S_(2)=500m," Time (t) = ?"`
`"Total length "S=S_(1)+S_(2)=20+500=520m`
Speed of trains `s=40kmh^(-1)=40xx(5)/(18)m//s=11ms^(-1)`
`"Time (t)"=("Distance")/("Speed")=(520)/(11) 47s`
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