let x = acres of grass you can mow in 1 hour

45 min = 45/60 hr = 9/10 hr

x*(9/10) = 3/8

by solving we find:

x = 5/12 acres per hour

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in 1 hour you can mow 5/12 acres of grass.

If I can mow 3/8 of an acre of grass in 45 minutes, how many acres can I mow in 1 hour?

answer:

let x = acres of grass you can mow in 1 hour

45 min = 45/60 hr = 3/4 hr

x*(3/4) = 3/8

by solving we find:

x = 1/2 acres per hour