a 450 meter long train crossed a pole in 18 second at one station some of the carrige are remove near the next station it crossed the 15 second what is the length of the now
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total time = 18s
total distance=2×length of train
2×450=900
1second distance=900÷18=50
in 12s= 50×12=600
length of train now= 600÷2=300m
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