A 600 meter long train crosses a signal post in 20 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?
Choose the correct choice from the following answers
A) 4 min B) 2 min C) 8 min D) 9 min E) 5 min
S = 600/20 = 1530 mps   S = 3600/30= 
<gadget id="calculator">3600/30</gadget>
<output>120</output>
120 sec= 2 min   Answer: 2 min
<result>B</result>
A 600 meter long train crosses a signal post in 20 seconds. How long will it take to cross a 3 kilometer long bridge, at the same speed?