self Maths Puzzle number series

Q. HOW TO CALCULATE UNIT DIGIT OF 51^488

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self Other Question

Q. How cut 16*9 plate to make it 12*12. Q. P alone would take 8 hr more to complete a job than both P and Q would together. If Q worked alone, he took 9/2.hrs more to complete it than P and Q. What time they take if P and Q work together?