Train A and Train B are running on parallel tracks with the speeds of 72 kmph and 54 kmph, respectively. If they move in the same direction, Mr. Ravi, who sits in the slower train, observes that the faster train passes him in 18 seconds. If they move in opposite directions, both the trains pass each other in 24 seconds. Find the length of the slower train.

Using the relative speed formula for objects moving in opposite directions, the sum of the lengths of both trains is (72 + 54) * (5/18) * 24 = 840 meters. Using the relative speed formula for the same direction, the length of the faster train is (72 - 54) * (5/18) * 18 = 90 meters. Subtracting the length of the faster train from the total length gives the length of the slower train as 840 - 90 = 750 meters, so the result is 750 metres.

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