The area of a rectangular plot of land is 58 of a square mile. If this plot of land is 34 of a mile wide, what is the length, in miles, of this plot of land

Pls! does anybody know a shortcut for answering these types of questions in the future?

Fatima plans to spend at least $15 and at most $20 dollars on sketch pads and pencils. if she buys 2 sketchpads, how many pemcils can she buy while staying in her price range? fatima can buy between and pencils. ? (type whole numbers. use ascending? order.)

Me d is also an option but i couldn't get it in the picture