A 210m long train crosses a bridge of 90m length in 50 secs in what time will it cross a tunnel 210m long?
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117km/h
Step-by-step explanation:
Distance=210 m
Time=6 s
RelativeSpeed=timedistance
⇒6210=35m/sec=35×518=126km/h
Since man is running in opposite direction of the train then
Relative speed=speed of the train+speed of the man
∴Speed of the train=126−9⇒117km/h
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