D = 90 + 120 = 210
S = 54 * 5/18 = 15 mps
T = 210/15 = 14 se
A train 90 meters long is running with a speed of 54 kmph. The time taken by it to cross a tunnel 120 meters long is?

  * 29
  * 18
  * 14
  * 99
  * 13