MrSmithlikesbeexact.Onedaywhenheiswalkinginthestreet,amancomesoverandaskshim:"Excuseme,butwhere'sthenearestbookshop?""ThenearestbookshopYouhavetocrossabridge.andthenturntotheright.""andisthebridgeislong?""very!thirtymetres."themanthankshimandgoestowardsthebridge.suddenlyhehearssomeonerunningafterhim."shop!"Mrsmithisshouting!"I'msorry,Ijustremember:thebridgeisfortymetreslong.Ifyougothirtymetresandthenrurntotheright,asItellyoutodo,you'llfallintotheriver."