A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 9 kilometer long bridge, at the same speed? Choose the most appropriate option:  A) 4 min  B) 2 min  C) 10 min  D) 9 min  E) 3 min

Rationale: "s = 600 / 40 = 15 mps s = 9000 / 15 = 600 sec = 10 min . answer : c"
Answer: C