book Maths Puzzle Numerical Ability

Solve: 3t - 4(5 - t) = t - 8

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how dose algebra work with out graphing A plane travels with a tail wind (100) miles to the nearest town in (60) minutes. The plane then travels back (100) miles with a head wind. The travel time is (40) min more than the first trip. What is the speed of the wind, and the speed of the plane?