Question

two trains of the same length but with different speed pass a static Pol in 4 second and 5 second respectively in what time they will cross Each Other when they are moving in opposite direction​

Answer 1

Answer:

let the length of the train be d

speed of one train =d/4

speed of second train= d/5

if two trains are traveling in opposite direction then speed will be d/4 + (d/5) =9d/20

total distance to be covered=2d

therefore time = 2d/(9d/20) = 40/9 sec