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The world's record in the 400-m dash is 43.18s, and in the 40-yd dash it is 4.24s. a) Find the speed in mi/hr of the

The world's record in the 400-m dash is 43.18s, and in the 40-yd dash it is 4.24s.

a) Find the speed in mi/hr of the runner who set first record (43.18s).

b) Find the speed in mi/hr of the runner who set second record (4.24s).

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