a 1200 m long train crosses a tree in 80 sec , how much time will i take to pass a platform 1000 m long ?
"l = s * t s = 1200 / 80 s = 15 m / sec . total length ( d ) = 2200 m t = d / s t = 2200 / 15 t = 146.66 sec answer : b"
divide(add(1200, 1000), divide(1200, 80))