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Mathematics, 21.06.2019 17:00
Two planes leave an airport at the same time, one flying east, the other flying west. the eastbound plane travels 20 mph slower. they are 1600 mi apart after 2 hr. find the speed of each plane.
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Mathematics, 21.06.2019 23:20
Using only the digits 5, 6, 7, 8, how many different three digit numbers can be formed if no digit is repeated in a number?
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