You have found a mutant algae that doubles in size every hour

You have found a mutant algae that doubles in size every hour. It takes 18 hours for one algae plant to take up half of a certain lake. How long would it take for two of these plants to take up half of the same lake?

AQuA-RAT — Algebra Question Answering with Rationales (Ling et al., DeepMind, 2017) · train #44148