Answer:
The answer is 6
Explanation:
Gotta convert this to make it save some time.
1 over 18 = 1/18
1 over 3 = 1/3
If 1/18 of a lawn is wattered in 20 mins, (Simply coverting 1/3 hr to mins by doing 60/3) 20 * 18 = 360 Mins = 6 Hours
It takes 6 hours to water the entire lawn
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