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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 ?

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



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It is 1000 m / 20 sec = 50 m/sec  =  50 * 3600 / 1000 Kmph = 180 kmph

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