[Lab_3] Add forgotten implementation of GetTimePassed
[Lab_3] Add forgotten implementation of GetTimePassed

akashin/HSE_AI_Labs,akashin/HSE_AI_Labs,viviken/HSE_AI_Labs,akashin/HSE_AI_Labs,viviken/HSE_AI_Labs,akashin/HSE_AI_Labs,akashin/HSE_AI_Labs,akashin/HSE_AI_Labs,viviken/HSE_AI_Labs,akashin/HSE_AI_Labs,viviken/HSE_AI_Labs