Are you smarter than a fifth grader- Part 5

Algebra Level 4

In a 1 km race, A wins B by 40 meters and A wins C by 70 meters (same race). Assuming that they run at constant speed, the distance by which B wins C in the race can be expressed in the form xy \frac{x}{y} , where xx and yy are coprime positive integers. Find x×y x \times y .

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