Build a road. After five days, it is more than 160 meters above the midpoint. The rest will continue to be built at the original speed. It can be completed in four days. How long is the road?

Build a road. After five days, it is more than 160 meters above the midpoint. The rest will continue to be built at the original speed. It can be completed in four days. How long is the road?

(4+5)/2=4.5
5-4.5=0.5
(4+5)/0.5=18
18*160=2880(km)