The length of a bridge in meters, which a train 100-meters long and traveling at 45 km/hr can cross in 30 seconds is?  Choose the correct option:
A) 225 B) 245 C) 275 D) 325 E) 375
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+100 = 375 meters   x = 275 meters   The answer is 275.
<result>C</result>
The length of a bridge in meters, which a train 100-meters long and traveling at 45 km/hr can cross in 30 seconds is?