Expand the wings of your imagination, guess as many practical problems as possible from the equation X10 + X + 215 = 1, write them out and solve them

For example: for a project, Party A will complete it in 10 hours, and Party B will complete it in 15 hours. Now, Party B will do it for 2 hours first, and then Party A and Party B will cooperate. How many hours will it take to complete it? Let it take x hours to complete, then the equation is: x 10 + X + 215 = 1, and the solution is: x = 5.2, that is, 5 hours and 12 minutes

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