general Maths Puzzle

A clock gains 18 seconds per day and another loses 39 seconds per day. After what length of time will the first clock 12 hrs ahead of the second?

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general Other Question

Fill the missing entries in the below series

2, 5, 12, 65, 729,??
At a club each member shook hands with every other member. If there were totally 1042 handshakes how many members were present?