Physics help!!! Projectile motion problem!?

A spy in a speedboat is being chased down a river by government officials in a faster craft. Just as the officials' pulls up next to the spy's boat, both boats reach the edge of a 5.0m waterfall. If the spy's speed is 15m/s and the officials' speed is 26m/s, how far apart will the two vessels be when they land below the waterfall?