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I just started learning physics and already am stuck

Train starts moving with constant acceleration a . In five minutes it travels 5 kilometers . Find a !

S = a * t^2 / 2

a = 2 * S / t^2

My question is why does this formula work only if we express time in seconds ?

If I don't convert 5 minutes into seconds prior to putting variable t into formula , the result is wrong .

Why not correct when t is expressed in minutes , and wrong when expressed in seconds ?

When deriving that formula , I found nothing nothing in it that was specific only for seconds

thank you