A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 7.2 kilometer long bridge, at the same speed?  Choose the correct choice from the following
A) 4 min	B) 2 min	C) 8 min	D) 9 min	E) 3 min

Rationale: "s = 600 / 40 = 15 mps s = 7200 / 15 = 480 sec = 8 min . answer : c"
Answer: C