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?
Pick one:	A) 4 min	B) 6 min	C) 8 min	D) 2 min	E) 9 min
S = 600/40= 
<gadget id="calculator">600/40</gadget>
<output>15</output>
15 mps   S= 3600/15= 
<gadget id="calculator">3600/15</gadget>
<output>240</output>
240 sec= 4 min   4 minnswer: 4 min
<result>A</result>
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?