Please choose the correct answer to the question: A group of Canada geese left a Florida lake in the spring. The geese arrived at a Maine lake 2,000 km away in 40 days. If the geese traveled at a constant rate, how far did the geese travel on the first day?

Answer1: 5 km Answer2: 20 km Answer3: 40 km Answer4: 50 km

Answer format: answer1/answer2/answer3/answer4