Genesis 7:11 Meaning

9There went in two and two unto Noah into the ark, the male and the female, as God had commanded Noah.

10And it came to pass after seven days, that the waters of the flood were upon the earth.

11In the six hundredth year of Noah's life, in the second month, the seventeenth day of the month, the same day were all the fountains of the great deep broken up, and the windows of heaven were opened.

12And the rain was upon the earth forty days and forty nights.

13In the selfsame day entered Noah, and Shem, and Ham, and Japheth, the sons of Noah, and Noah's wife, and the three wives of his sons with them, into the ark;