a 600 m long train crosses a tree in 60 sec , how much time will it take to pass a platform 450 m long ?
"l = s * t s = 600 / 60 s = 10 m / sec . total length ( d ) = 1050 m t = d / s t = 1050 / 10 t = 105 sec answer : e"
divide(add(600, 450), divide(600, 60))