I believe it's 4. 1/2 = 1/4
so, 1/2 + 1/2 + 1/2 + 1/2 would be 4/4...
Try this option (see the attacthed file; answer is marked with red colour); note, that

answer: 2 m/h.
Answer:
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Answer: GCF = 5<u>To find GCF:
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25 = 5 x 5
40 = 5 x 8
GCF ⇒ Find the common factors.
Here, there is only 5 that is common. So 5 is the GCF.