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Two bicyclists travel in opposite directions around a quarter-mile track and meet every 22 seconds. When they travel in the same direction on this track, the faster passes the slower once every 3 minutes and 40 seconds. Find the rate of each rider
Now there is a wall 5 feet thick and two rats tunnel from opposite sides.
Two officers each have a company of men, the one has 40 less than the other.
Images from a 16th century text about the astrolabe and its uses
A merchant woman buys and sells apples and pears for Denaros. How much did she invest in apples; how much in pears?
An old Chinese general led his army to a river with a steep bank. Standing atop the bank, he held a stick 6 feet long perpendicular to himself.
A new sourcebook containing the works in their original form along with a translation and a brief commentary.
Two ants are 100 paces apart, crawling back and forth along the same path. The first goes 1/3 pace forward a day and returns 1/4 pace; the other goes forward 1/5 pace and returns 1/6 pace. How many days before the first ant overtakes the second?
There are two numbers whose sum equals the difference of their squares.
A biography of Arthur Cayley, the outstanding mathematician of Victorian Britain.

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