320 minutes = 19,200 seconds= 5 hours and 20 minutes=5 1/3 hours
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Ten minutes is too long ( a time). The sentence Ten minutes are too long means that ten of the minutes are longer than the others.
2 hours and 42 minutes; or, 9720 seconds
p/4 - 320
5x3 = 320 x3 = 320/5 = 64 So x = cuberoot(64) = 4
It is: (240+320)/2 = 280