Jim tried to swim across an 80m wide river but the current carried him 30m downstream. How far did he swim

To determine how far Jim swam, we need to find the distance he traveled perpendicular to the river. This distance is equal to the width of the river minus the distance he was carried downstream.

So, to find how far Jim swam, we subtract the distance carried downstream from the width of the river:

Distance Jim swam = Width of river - Distance carried downstream
Distance Jim swam = 80m - 30m
Distance Jim swam = 50m

Therefore, Jim swam a distance of 50 meters.