en un estante se colocaran 3 libros de matematica (Distintos) y 6 libros de ciencia natural (distintos) de cuantas formas pueden ordenarse de modo que no queden juntos los 3 libros de matematica Ayud doy como mejor respuesta al que me ayude

Three friends went on a road trip from phoenix, az, to san diego, ca. mark drove 50 percent of the distance. jason drove 1/8 of the distance. andy drove the remainder of the distance. 1. andy thinks he drove 1/4 of the distance from phoenix, az, to san diego, ca. is andy correct? 2. the distance from phoenix, az, to san diego, ca, is 360 miles. how many miles did each person drive? 3. solve the problem. what is the answer in total?