A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is? Choose the correct choice from the following:  A) 41 sec  B) 42 sec  C) 43 sec  D) 48 sec  E) 47 sec
48 sec   48 sec   48 sec = 540 + 180= 
<gadget id="calculator">540 + 180</gadget>
<output>720</output>
720   S= 54 * 5/18= 
<gadget id="calculator">54 * 5/18</gadget>
<output>15</output>
15 mps   T= 720/15= 
<gadget id="calculator">720/15</gadget>
<output>48</output>
48 sec
<result>D</result>
A train 540 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 180 meters long is?