Two trains ` 120m ` and ` 100 m` in length are tunning in opposite directions with velocityes ` 42 km h^(-1) ` and ` 30 km h^(-1)` In what tiem they will completely cross each other ?

Explanation

To solve the problem of how long it will take for two trains to completely cross each other, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the lengths of the trains:**
- Train 1 length = 120 m
- Train 2 length = 100 m

...