por regla de tres
4 - 60
8 - x x = (8*60)/4 =120
4-60
9-x x=(9*60)/4=135
(10*60)/4= 150
(16*60)/4= 240
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por regla de tres
4 - 60
8 - x x = (8*60)/4 =120
4-60
9-x x=(9*60)/4=135
(10*60)/4= 150
(16*60)/4= 240