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?  Choose the correct choice: A) 4 B) 5 C) 6 D) 7 E) 8
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   4nswer: 4
<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?