If the worm is traveling at a rate of 3 feet per minute and had already traveled 1 foot when you started watching, then it would take the worm 7 minutes to travel the remaining 10 - 1 = <<10-1=9>>9 feet. This is because 9 feet / 3 feet/minute = <<9/3=3>>3 minutes. Since the worm had already traveled for 1 minute before you started watching, it would take a total of 3 minutes + 1 minute = <<3+1=4>>4 minutes for the worm to crawl 10 feet.