Milo researched the estimated lengths of several rivers online. on one website, he found some of the lengths were in kilometers and some were in miles. after converting all the lengths into miles, he recorded his findings below.

river and location length (in miles)
salween river (asia) 1,491.29
yukon river (n. america) 1,979.07
madeira river (s. america) 2,019.456
murray river (australia) 1,558.398

based on this table, he made several concluding statements about his research. which of his statements are correct?

together, the salween river and the murray river are 1,029.971 miles longer than the madeira river.
the salween river is 487.78 miles shorter in length than the yukon river.
the madeira river and the salween river together are longer than the yukon river and the murray river together.
the madeira river and the yukon river together are 3,998.526 miles in length.