Gavin mows 75% of the lawn in 42 minutes. How long will it take him to mow the entire lawn if he mows at a constant rate?

Answer 1

3/4 of the lawn in 42 minutes

1/4 of the lawn in 42/3 = 14 minutes

4/4 of the lawn in 3/4+1/4 = 1, so 42+14 = 56 minutes to do the whole lawn at the same pace