<PRE><B>Question 936514</B>
x = length of 5th flight in hours
y = sum of lengths of first 4 flights in hours
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y = (2+10/60) + (3+20/60) + (1+15/60) + (2+40/60)
y = 9.4166666666
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( y + x )/5 = (2+28/60)
( y + x )/5 = 2.4666666666
x = 2.4666666666*5 - y
x = 2.4666666666*5 - 9.4166666666
x = 2.916666666
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answer:
the 5th flight lasted 2.917 hours
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