If a sprinkler waters 1 over 8 of a lawn in 1 over 2 hour, how much time will it take to water the entire lawn? 2 hours 4 hours 10 hours 16 hours

First simplify

1/2=1

1/8=1/4

In one hour a quarter(fourth) of the field is watered, in 4 hours the field is completely watered

(1/2 hr) / (1/8 lawn) = 4 hours/lawn