An airplane

An airplane flies 1440 km in 2 1/4 hours. What is its average speed in km per hour?

Correct answer:

v =  640 km/h

Step-by-step explanation:

s=1440 km t=214=2+14=2 4+14=94=2.25 h  v=s/t=1440/2.25=640 km/h



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