A train ,135 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. The length of the bridge is Choose the most appropriate option:  A) 270 m  B) 245 m  C) 235 m  D) 220 m  E) 240 m
240 mxplanation:   Assume the length of the bridge = x meter   Total distance covered = 135+x meter   total time taken = 30s   speed = Total distance covered /total time taken = (135+x)/30 m/s   =&gt; 45 Ã— (10/36) = (135+x)/30   =&gt; 45 Ã— 10 Ã— 30 /36 = 135+x   =&gt; 45 Ã— 10 Ã— 10 / 12 = 135+x   =&gt; 15 Ã— 10 Ã— 10 / 4 = 135+x   =&gt; 15 Ã— 25 = 135+x = 375   =&gt; x = 375-135= 
<gadget id="calculator">375-135</gadget>
<output>240</output>
240   Answer: Option 240 m
<result>E</result>
A train ,135 meters long travels at a speed of 45 km/hr crosses a bridge in 30 seconds. The length of the bridge is