two particles `A` and `B` are at separation of `100 m`. They move towards each other with uniform speed, `A` with `5 m//s` and `B` with `15 m//s`. When and where the two particle meet?

Explanation

Let the particles meet after time t and at distance d from the initial position of `A`.

For `A:d=5t …(i)`
For `B: 100-d=15t …(ii)`
Solvind, `t=5 s, d=25m`