D = 540 + 180 = 720
S = 54 * 5/18 = 15 mps
T = 720/15 = 48 se
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?

a. 18 sec
b. 28 sec
c. 48 sec
d. 29 sec
e. 24 sec