(A) 130
(B) 360
(C) 500
(D) 540
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(A) 130
(B) 360
(C) 500
(D) 540
Answer: Option (C) 500
Explanation:
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.