mot doi cong nhan duoc giao dap 4 km duong . de hoan thanh cong viec dung ke hoach thi moi ngay phai lam viec 8 gio . truoc khi khoi cong , doi duoc dieu them 30 nguoi cung lam va duoc giao dap them 1 km duong nua . hoi de hoan thanh dung ke hoach thi moi ngay phai lam viec may gio ?