Given the following reasoning and answer, what was the question? S = 600/20 = 1530 mps
S = 3600/30 = 120 sec = 2 min
 The answer: (B)
The question A 600 meter long train crosses a signal post in 20 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
Options:
(A) 4 min
(B) 2 min
(C) 8 min
(D) 9 min
(E) 5 min