This task is for 11th grade pupils! (For 12th grade pupils if contestant is studying according the 12-year educational system)

Attention! These problems may have in the answer box either an integer or a finite decimal fraction answer only. Do not write dimensions in the answer form.

This task is for 11th grade pupils! (For 12th grade pupils if contestant is studying according the 12-year educational system)

Attention! An answer must be given as a finite decimal in the International System of Units (SI) and the numerical error should not exceed 10% unless otherwise stated.