self Maths Puzzle

If 12 carpenters working 6 hours a day can make 460 chairs in 24 days, how many chairs will 18 carpenters make in 36 days, each working 8 hours a day?

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self Other Question

Maximum power of 2 is 4 in c. and either a or b will take 3 and other will take 0, 1, 2, 3? A boy reached school 10 min early if he travels at a speed of 4 Kmph. But If he reduces his speed to 3 Kmph, He is 10 min late. What is the Distance between his school and House?