Let x be the distance the second spelunker descended so that the first spelunker descended 2x+198, both in ft.

Since the first spelunker descended a 1218 ft, we can write:

2x+198=1218

Subtract 198 from both sides:

2x=1020

Divide both sides by 2:

x=510

So, the second spelunker was able to descend a distance of 510 feet.

Since the first spelunker descended a 1218 ft, we can write:

2x+198=1218

Subtract 198 from both sides:

2x=1020

Divide both sides by 2:

x=510

So, the second spelunker was able to descend a distance of 510 feet.