what is average speed in miles per hour of a plane that covers 120 miles in 1 hour and 20 minutes
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Total time in hour=1h+20/60h
=1+1/3
=4/3h
Total distance in mile =120
Then average speed=120/4/3
=90mile per hour
=1+1/3
=4/3h
Total distance in mile =120
Then average speed=120/4/3
=90mile per hour
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