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" ... 7. A person walking along the road in a fog meets one waggon and overtakes another which is travelling at the same rate as the former. and he observes that between the time of his first seeing and passing the waggons, he walks 20 yds. and 60 yds. "
A school algebra to quadratic equations - Σελίδα 73
των Charles Mansford - 1875
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