How far does the gray whales migrate and how fast does it swin?

To escape the frosty winter in the north. Each October, as the northern ice pushes southward, small groups of gray whales in the eastern Pacific start a two to three-month, 8,000-11,000 kilometers trip south. Traveling night and day, the gray whale averages approximately 120 kilometers per day at an average speed of 8 kilometers per hour. This round trip of 16,000-22,000 kilometers is believed to be the longest annual migration of any mammal