Question: A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?
Options:
(A) 22
(B) 27
(C) 48
(D) 99
(E) 23 Let's think first. Some random reasoning:
D = 540 + 180 = 720
S = 54 * 5/18 = 15 mps
T = 720/15 = 48 se The final answer: (C).