This calculation is wrong You've already fly with 3minutes 30 sec and you want to fly additional 21%. Where you wrote 80% wrong it supposed to be 21% since you want to use additional 21% to make it 80%. 210×21= 4,410 4,410÷59 = 74.745 74.745÷60= 1.245 Which is 1mimutes 4sec. So if you fly your plane more for 1 minute 4 sec you've surely use 80% of your battery and you will have 20% left
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This calculation is wrong
You've already fly with 3minutes 30 sec and you want to fly additional 21%.
Where you wrote 80% wrong it supposed to be 21% since you want to use additional 21% to make it 80%.
210×21= 4,410
4,410÷59 = 74.745
74.745÷60= 1.245
Which is 1mimutes 4sec.
So if you fly your plane more for 1 minute 4 sec you've surely use 80% of your battery and you will have 20% left