exam Maths Puzzle Numerical Ability

I have a final tomorrow and this question is on the review.
Factor completely:
x^3+x^2-25x-25

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exam Other Question

I got one more that is giving me problems! HELP PLEASE!! THANK YOU!

(2x/2x)(3x/5x)
/=the radical sign

Thanks in advance!
ac An old-model machine can stamp 1000 parts in 4 hours, but his helper would require 6 hours to do it alone. How long will it take them to do it if they work together.