Two trains of same length take 60 seconds and 90 seconds, respectively to cross a pole. If both the trains are running in the same direction, then how long will they take to cross each other?

Let L be the length of each train. Speed of first train = L/60 (m/s). Speed of second train = L/90 (m/s). When moving in the same direction, relative speed = L/60 - L/90 = L/180 (m/s). To cross each other, they must cover the combined distance of 2L. Time = Distance/Speed = 2L ÷ (L/180) = 2L × 180/L = 360 seconds. This is a standard relative speed problem where trains of equal length cross each other moving in the same direction. Option B (360 seconds) is correct.