A train, 800 meter long is running with a speed of 78 km/hr. It crosses atunnel in 1 minute. What is the length of the tunnel (in meters)?
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SPEED = 75X5/18 M/SEC=65/3 M/SEC
LENGTH OF TUNNEL=X m
DISTANCE=800+X
TIME=I/60 MIN
65/3=800+X/60
3(800+X)=3900
800+X=1300
X=500
LENGTH OF TUNNEL=500 m
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