The length of a bridge in meters, which a train 80-meters long and traveling at 45 km/hr can cross in 30 seconds is?  Choose the most appropriate option.
A) 215
B) 235
C) 255
D) 275
E) 295
45 km/h = 45000 m/3600 s = 12.5 m/s   In 30 seconds, the train can go 30(12.5) 45000  /3600= 
<gadget id="calculator">45000  /3600</gadget>
<output>25/2 = around 12.5</output>
12.5 m/s   In 30 seconds, the train can go 30(12.5)= 375 meters   Let x be the length of the bridge.   x+80 = 375 meters   x = 295 meters   The answer is 295.
<result>E</result>
The length of a bridge in meters, which a train 80-meters long and traveling at 45 km/hr can cross in 30 seconds is?