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An airplane traveled a distance d in t hours, where r>1, and arrived one hour late. The airplane would have arrived on time if it had traveled at what rate per hour?
a. t-1
b. d/t-1
c. d/t+1
d. d/t-1
e. d/t+1

  • Math -

    speed = distance/time.

    its speed was d/t
    on time its time would have been 1 hour less, so its speed would be d/(t-1)

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