exam Maths Puzzle Numerical Ability

Frank can complete a job in 5 hours. Joe can do it in 8 hours. After Frank had worked for two hours, Joe was asked to help Frank complete the job. In how many hours after Joe has started will they complete the job?

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exam Other Question

question one:
give three solutions for (((-2x+5y=1)))
i don't understand how and what they want me to do for this question.

question two:
how do i solve this equation (((1+ B is the interior of <AOC. C in the interior of <BOD. Dis in the interior of <COE. m<AOE = 175, m<COE = 110 and m<AOB = m<COD = m<DOE.

Find m<BOC.