A) 500 m
B) 550 m
C) 600 m
D) 900 m
Correct Answer: D
Solution :
Sol. [d] Let the length of the tunnel be x m. Speed of train\[=\,90\,km/h\,=\,90\,\times \,\frac{5}{18}\]m/sec = 25 m/sec Time taken to cross tunnel = 1 min = 60 sec Now, Total distance covered by train = (600 + x) m We know that, \[Speed\,=\,\frac{Dis\tan ce}{Time}\] \[\therefore \,\,\,\,25=\frac{600+x}{60}\,\Rightarrow \,x+600\,=\,1500\] x = 900 m
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