The questions given below contain three statements giving certain data. You have to decide whether the data given in the statements are sufficient for answering the question? What is the speed of a running train? I. The train crosses another train running in the opposite direction in 72 seconds. II. The length of the first train is 100 metres. III. The length of the second train is 180 metres.

To find the speed of the first train, we need distance covered and time taken. When trains move in opposite directions, relative speed = sum of individual speeds. Distance = sum of lengths (100m + 180m = 280m), time = 72 seconds. So relative speed = 280/72 m/s. But we need the speed of the FIRST train specifically, not just relative speed. Without knowing the second train's speed, we cannot determine the first train's speed. The statements are insufficient.