S = 600/40 = 15 mps
S = 3600/15 = 240 sec = 4 min
A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
[1] 4 min
[2] 2 min
[3] 8 min
[4] 9 min
[5] 5 min