A highway construction project with a length of 30 miles consists of the following activities. The table below shows the items and their production rates. The production rates for some items are not constant. Activity Production Rate (miles per week) Survey and Layout 7.5 Clear and Grub 2.5 (for the first 5 miles) 5 (for the second 5 miles) 2.5 (for the next 15 miles) 5 (for the last 5 miles) Earthwork 1 (for the first 3 miles) 2.5 (for the next 10 miles) 17 (for the next 17 miles) Subbase 3 Base 7.5 Paving 5 Signage and Striping 15 Let's assume that two teams cannot be in the same location in the same week. How long does it take to finish the project? Determine the start and finish dates of each activity using a velocity diagram. It is recommended to use Excel.