book Maths Puzzle Numerical Ability

Working together, Joe and Jim can dig a ditch in 7 hours. Working alone, it takes Jim 2 hours longer than it takes Joe. How long will it take Joe to dig the ditch alone.

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book Other Question

CAN SOMEONE TEACH ME HOW TO DO LINEAR INEQUALITIES?
like - how do i find a boundry of a line?
ex. y>x y=____ The local sandwich shop has 3 cash registers. In howmany possible ways can 4 customers lineup at the registers?