The number of flights leaving a certain airport doubles during every one-hour period between its 9 am opening and noon; afternoon, the number of flights leaving from the airport doubles during every two-hour period. If 4 flights left from the airport between 9 am and 10 am, how many flights left the airport between 2 pm and 4 pm?
A. 128
B. 32
C. 48
D. 64
E. None of these
সঠিক উত্তরঃ
D.
64
Explanation:
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