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Neeraj has a rectangular field of size $20 \times 40$ sq.mt. He has to mow the field with a moving machine of width $1$ mt. If he mows the field from the extremes to the centre, then the number of rounds taken by him to mow half of the field will be

1. $3.5$
2. $3.8$
3. $3$
4. $4$

1
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