Sierra's swimming lessons last 1 hour 20 minutes. she finished her lesson at 10: 50 am. at what time did her lesson start?

Given the following statements, which is the best

If you have 12 feet of string and you cut it into equal length of 5 inches each how much string will be left

What is the length of the segment, endpoints of which are intersections of parabolas y=x^2− 11/4 x− 7/4 and y=− 7 /8 x^2+x+ 31/8 ?