book Maths Puzzle Numerical Ability

The time required to complete a job varies inversely as the number of people working. It too 4 hours for 7 electricians to wire a buikding. How long would it have taken 3 electricians to have done the job?

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book Other Question

can you please help me to factorize the following
1. a^2(b+c)+b^2(c+a)+c^2(a+b)+2abc

2. ab(a^2-b^2)+bc(b^2-c^2)+ca(c^2-a^2)

3. Use factor theorem to prove ;(x+y+z)^3-(y+z-x)^3-(z+x-y)^3-(x+y-z)=24xyz I've been trying to figure out how to get an answer for these two equations, plus their explanations if possible.

1. A if/then (B if/then C)
2. A and X
3. B and (Y and Z)-