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two planes take off from an airport at the same time and head in opposite directions at 260mph and 275mph respectively. in how many hours will they be 1605 miles apart?

  • algebra -

    distance covered by first plane --- x miles
    distance covered by second plane --- 1605-x miles

    time taken by first plane --- x/260 hours
    time taken by second plane -- (1605-x)/275

    aren't those two times equal?
    set the above times equal to each other and solve

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