One teacher can grade an exam in 8 hours. The same exam would take a second teacher 12 hour, and a third teacher would take 10 hours. How long would it take for all 3 teachers worked together?

The answer would be d i think but i’m for sure it is not a and c

Dwould be the answer

The academic affairs council is the highest expert body processing academic affairs, as stipulated by the university statutes. specialist aaro häkkinen (educational policy) took part in the council’s meeting. the agenda of the meeting included bachelors’ feedback, the timing of pedagogical studies, the grant system for tuition fees, the standardisation of administrative practices for internships and the situation of foreign-language and multilingual master’s programmes.