Farmer Faye has all of her ducks and all of her pigs in her barn. She has 12 animals in the barn and they have 32 legs. How many
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recall d = rt, distance = rate * time.
let's say airplane A is going at a rate of "r", therefore airplane B is moving faster, at a rate of "r + 80".
now, after 3 hours, both planes have been travelling for 3 hours each, and say if A has covered "d" miles, then B has covered the slack of 2490 - d.