Capgemini Maths Puzzle General Ability General Knowledge

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Capgemini Other Question

two cog wheels having teeth 16 and 24 respectively, the bigger wheel make 5 revolution per hour. Then find in how many times the specific peak of the bigger wheel meets the specific peak of the smaller wheel? If a2+b2-4(a+b)= -8,then the value of (a-b) is:
A. 4
B. 0
C. 2
D. 8