A train passes an electrical pole in 15 seconds and passes a platform 420 m long in 60 seconds. Find the length of the train.
Let the length of the train be ‘x’ meter. ∴ x/15 = (x + 420)/60 ⇒ 60x = 15x + 6300 ⇒ 45x = 6300 ⇒ x = 140 m
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