nam lam xong bai tap luc 8 gio 45 phut . hoi nam bat dau lam bai luc nao ? biet thoi gian lam bai la 1 gio 30 phut

luc 10 gio 2 pht bn long bat dau lam bai thi violympic vong thi cap quoc gia thoi gian bn long hoan thanh cac cau hoi va nop bai thi hat 2273 giay hoi bn  long nop bai thi luc may gio

bai1 hoa lam bai tap luc 8gio 45 phut .hoi hoa bat dau lam bai vao luc nao?biet thoi gian 

hoa lam bai la1 gio 30 phut

bai 2 trong 5gio 30 phut mot cong nhan lam duoc 3 chi tiet may .chi tiet may thu nhat lam het 1gio 30 phut chi tiet 

may thu hai lam het 1gio 40 phut .hoi chi tiet may thu 3 lam het bao nhieu thoi gian?

 bai 1 

mot nguoi tho lam mot san pham het 1 gio 24 phut . hoi muon lam xong 60 san phamtrong 10 ngay thi trung binh moi ngay nguoi tho do phai lam may gio ?

bai 2

quang duong noi _ hai duong l 56 km .Mot o to khoi hanh tu ha noi -luc 7 gio 6 phut  , den hai duong luc 8 gio 3o phut . tinh van toc cua o to

phai co loi giai nhe thi moi tich ! ! ! ! ! !

Lan ngoi hoc bai luc hon 2 gio mot chut .Khi lan lam xong bai thi thay 2 kim dong ho da doi cho cho nhau . hoi lan lam bai het bao nhieu thoi gian ?

Ai giai duoc thi nho ghi cach lam nha !

tuan lam bai xong luc 8 gio 45 phut.tuan bat dau lam bai khi nao, biet tuan lam bai trong 1 gio?

An ngoi lam van vao luc hon 2 h mot chut khi An lam xong thi 2 kim dong ho da doi cho cho nhau hoi An lam van het bao nhieu phut biet khi an lam xong thi khi do da hon 3 h

1 nguoi tho may 3 san pham trong 7gio45phut neu nguoi do may 5 san pham den bao gio xong biet nguoi tho bat dau lam vierc luc 7 gio 15 phut va nghi an trua 45 phut

Mot nguoi tho lam viec tu 7 gio 30 phut sang den luc 11 gio 20 phut thi duoc 2 san pham . Hoi lam 3 san pham thi nguoi do lam den bao nhieu gio ? Biet thoi gian nghi trua la 1 tien dong ho