A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 1.8 kilometer long bridge, at the same speed? Choose the correct answer:
A) 4 min	B) 2 min	C) 8 min	D) 9 min	E) 3 min
S = 600/40= 
<gadget id="calculator">600/40</gadget>
<output>15</output>
15 mps   S= 1800/15= 
<gadget id="calculator">1800/15</gadget>
<output>120</output>
120 sec= 2 min.Answer: 2 min
<result>B</result>
A 600 meter long train crosses a signal post in 40 seconds. How long will it take to cross a 1.8 kilometer long bridge, at the same speed?