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  1. In an aerial puhotogrammetric survey, if the exposure interval is 20 seconds to cover ground distance of 1000 m between exposures, what would be the ground speed of the aircraft ?

    2. A.
    90 km/hour
    B.
    120 km/hour
    C.
    150 km/hour
    D.
    180 km/hour

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    Answer : Option D

    Explanation :

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