Pipe A alone can fill a cistern in 8 hours, and pipe B alone can do the same task in 6 hours. They are opened together, but after 2 hours, a third pipe C is also opened, which can empty the cistern in 12 hours. How much total time (in hours) is required to fill the cistern?

Which Indian independence movement leader was primarily known for his philosophy and practice of non-violent civil disobedience?

Who gave the call for 'Do or Die' during the Quit India Movement in 1942?

Which of the following revolutionary pairs were imprisoned together in Cellular Jail and faced harsh conditions, contributing significantly to the Indian independence movement?