A train speeds past a pole in 15 seconds and a platform 100 m long in 25 seconds. Its length is:?
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let the length of the train be X meters and its speed by Y m/sec
then,x/y=15⇒y=x/15
∴x+100/25=x/15
⇒15(x+100)=25x
⇒1500=10x
⇒x=150m
then,x/y=15⇒y=x/15
∴x+100/25=x/15
⇒15(x+100)=25x
⇒1500=10x
⇒x=150m
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