Meritnation experts tell me meaning of prolonged and efficiency i need easy definition also kindly make a sentence aldo define duration

Dear student,

'Prolonged' means 'continuing over a long time'.
For example: His illness was so prolonged that he lost a lot of weight.

'Efficiency' means 'achievement of the best production or result possible'.
For example: The students worked with efficiency to complete the assigned task within the given time period.

'Duration' means 'the time during which something continues'.
For example: The duration of the exam was three hours.

Regards