On one machine for 1 h made 6 details, and on another - is 2 details more, than on the first. In how many hours on each machine separately it is possible to make 216 details? In how many hours can two machines make 252 details, working at the same time?

229
1) 6 + 2 = 8 it is put. - for 1 h on other machine 2) 216: 6 = 36 h - for so many on 1 m machine 3) 216: 8 = 27 h - for so many on 2 m machine 4) 6 + 8 = 14 it is put. - for 1 h will manufacture both machines 5) 216: 14 = 15 3/7 h - for so much both machines, working together will make 216 details.
125
Answer add