Daily life in the UK : emploi du temps et present perfect

Read the following scenario and solve the grammar and time logic challenge. In a UK school, a typical student's day involves specific subject durations. Imagine Sarah has a Maths class starting at $09:00$. The lesson lasts for $75$ minutes. After a short break of $20$ minutes, she has a History lesson which lasts for $1.5$ hours (calculated as $1.5 \times 60 = 90$ minutes). 1) Calculate the exact time Sarah finishes her History lesson. 2) Rewrite the following sentence in the correct present perfect tense: 'She (not / finish) her history project yet.'