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Answer:900 km/hr
Step-by-step explanation:
Speed of plane = 300 km/hr
Speed of electing product combustion =1200 km/hr with respect to itself.
speed of combustion product is given by :
Relative speed of product combustion = Speed of plane + speed of product combustion
1200 = 300 + Speed of product combustion
1200-300 = Speed of product combustion
900 km/hr = Speed of product combustion
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