Let the train's length be L m and speed be v m/s.<br><br>&bull; Passing a pole: distance = L, time = 12 s → v = L/12.<br>&bull; Passing a 180 m platform: distance = L + 180, time = 24 s → v = (L + 180)/24.<br><br>L/12 = (L + 180)/24<br>2L = L + 180<br>L = 180 m.<br><br>Final Answer: 180 m