How many times in a day, are the hands of a clock in straight line but opposite in direction?

Question

How many times do the hands of a clock overlap in a day? What are the times? (round to the nearest second)

(The hands of a clock are the minute and hour hands, and a day starts at midnight).

Answer 1

11 times in 12 hours or 23 times in 24 hours as first time it happens in first hour and the last hour is incomplete and ends up with 11 or 23 cycles.