seven o'clock
`` Seems to me that it has quite a Mexican flavor to it , '' remarked Roger . `` Just see all the big hats and the fringed trousers . '' Now that they had come so far the chums were eager to get to the camp , and they could scarcely wait until the following morning . They found a comfortable hotel , had an early breakfast , and by seven o'clock were on their way westward . `` Now we are almost on the border , '' remarked Roger , as they stopped at a place called Del Rio . He was studying a railroad map . `` At the next place , called Viaduct , we will be on the Rio Grande , with Mexico just across from us . ''