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Tiempo transcurrido x, tiempo restante del día 24 - x.
x = 3/5 (24 - x)
x = 14,4 - 3/5 x
x + 3/5 x = 14,4
8/5 x = 14, 4
x = 14,4 ÷ 8/5
x = 9
Respuesta d. 9h
Si han trascurrido 9 faltan 15 y 3/5 de 15 es 9.