a 1100 m long train crosses a tree in 110 sec , how much time will it take to pass a platform 700 m long ?
l = s * t s = 1100 / 110 s = 10 m / sec . total length ( d ) = 1800 m t = d / s t = 1800 / 10 t = 180 sec answer : d
divide(add(1100, 700), divide(1100, 110))