exam Maths Puzzle Numerical Ability

I have been struggling on this math problem for awhile now and I was wondering if anyone could help me? I would deeply appreciate it!! Please and Thank you!!

Factor by Grouping
Factor
h^2-4k^2+4h-8k

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exam Other Question

One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together, how long would it take them to stock the shelf ? Six times the sum of a number and -15 is 76 more than four times the number. Find the number. (show your work)
Thanks From Precious