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70 BOY SCOUTS OF AMERICA The usual way to estimate long distances is by the time they take to cover. Thus, a good canoe on dead water goes 4 to 5 iluT-- ^ ; V ^'/S 'x..<«^^^ miles an hour. A man afoot walks 3^ miles an hour on good roads. A packtrain goes 2>4 miles an hour, or perhaps only ij4 on the mountain trails. A man's thumb is an inch wide. Span of thumb and longest finger, 9 inches. Brisk walking pace is i yard.
