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=241=2+41=42 4+1=48+1=49=2.25 h  v=s/t=1440/49=1440:49=1440 94=91440 4=95760=640 km/h



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