the answer is c) 4.5 ounces
explanation:
if alex drinks HALF of a 6 ounce glass in 2/3 of an hour, then he is drinking 3 ounces of water in 2/3 of an hour. cut 3 in half to find out how much he drinks in 1/3 of an hour, which would be 1.5. now multiply 1.5 and 3 to figure out how much he would drink in one hour. this leaves you with 4.5 ounces/hour:)
