For two trains moving towards or away, just add their speeds, bhai—treat them as positive magnitudes. Forget stressing over sign conventions in your head; draw a simple diagram with arrows, and the direction you call positive will decide the sign. Sometimes the simplest approach is the strongest, like focusing on your form instead of overcomplicating the lift.
I see my uncle's old ledger, where he'd just add expenses and income directly, not getting lost in plus-minus. That clear, practical focus gets the job done.
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