self Maths Puzzle

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?

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self Other Question

Q. HOW TO CALCULATE UNIT DIGIT OF 51^488 Q. If 3 men and 2 boys together earn 306 in 9 days while 7 men and 3 boys earn 639 in the same time. In how many days will 8 men and 6 boys together earn 376?