A. 130
B. 360
C. 500
D. 540
Speed = [ 78 x (5/18) ] m/sec = (65/3) m/sec
Time = 1 minute = 60 seconds
Let the length of the tunnel be x metres
Then, [ (800 + x) / 60 ] = 65/3
=> 3(800 + x) = 3900
=> x = 500
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