September 2018 1 57 Report
Di SMPN 21 ptk bel brbunyi stiap 40 m y skali, di SMAN 9 ptk bel brbunyi stiap 45 mnt skli dan di SMKN 7 ptk bel brbunyi stiap 50 mnt skli. jika bel dari ktiga sklh trsbt brbunyi scr brsamaan pada jam 07.00, stlh brp mntkah bel dri ktiga sklh trsbt? jam brpkh itu?

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