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29. (II) Estimate how long it would take one person to mow a football field using an ordinary home lawn mower (Fig. 1-15). (State your assumption, such as the mower moves with a 1-km/h speed, and has a 0.5-m width.) 5 0 FIGURE 1-15 Problem 29.
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Answer #1

A football field is 120 yards long (including the end zones) and 53.3 yards wide

In meters, that is 109.728 m by 48.78 m

The area is 5353 m2.

The speed of the mover is 1 km//hr which is 0.278 m/s

Time = Area of field / (velocity * width)

Time = 5353/(0.278) *(0.5) = 38510.79 sec

Time = 38510.79/3600 hr

Time = 10.69 Hr

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