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The answer is 2.5, the (d) no. option.
Step-by-step explanation:
The plane in 3 hrs or (3×3600) sec or 10800 sec cross 2700 km
The plane in 1 sec cross (2700/10800) km
The plane in 10 sec cross (2700×10/10800) km or 2.5 km
Therefore, the plane cross 2.5 km in 10 sec. (Answer)
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