The lorry is travelling on bridge,it cannot bear even 1gm of weight falling on the bridge itself if even 1gm of weight is placed on bridge it will collapse and if even 1gm of weight is decreased then also the bridge will collapse after travelling some distance a crow had took rest on bridge,which means it had staid stable on bridge;why did the bridge didn't collapse????????
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The distance in which lorry travelled means some fueal had burnt instead of this lack of fueal ,the crow had stayed stable of same weight in which fuel burnt;the weight of crow and the fueal burnt had been balanced