Answer :

Let W1 be the work done by firstmachine.


Let W2 be the work done by second machine.


Work done by both the machines is Wt = W1xW2


Wt = 252 = 625


625 = 5x5x5x5 = 52x52


W1xW2 = 52x52


W1 = W2 = 52


Therefore, Neha can use a hook-up of two (x52) machines.


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