Answer:
look below
Explanation
First, we need to convert 2 2/3 hours to minutes. This would be: 
 
= 2 2/3 × 60 minutes 
 
= 8/3 × 60 minutes 
 
= 160 minutes 
 
Since water goes over a waterfall at a rate of 162 1/2 gallons every 15 minutes. The the gallons of water going over the waterfall in 2 2/3 hours would be: 
 
= (162 1/2 × 2 2/3hours) / 15 minutes 
 
= (162 1/2 × 160) / 15 
 
= 1733 1/3 gallon