A train which is 1 km long travelling at a speed of 80km /HR ,enters a tunnel 2 km of length .what time does the train take to come fully out of the tunnel?
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here,v=80km/HR
tunell is 2 km long.train is 1.
s =1 km
time =s/v
time=1/80hr
total time = 2*1/80
1/40hr
60/40min
3/2 or 1.5min or 90 sec
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