Code:
30,35,40,45,50,55 4 * * * /your/job/foo.ksh
0,5,10,15,20,25,30,35,40,45,50,55 5 * * * /your/job/foo.ksh
0,5,10,15,20,25,30,35,40,45,50,55 6 * * * /your/job/foo.ksh
0,5,10,15,20,25,30,35,40,45,50,55 7 * * * /your/job/foo.ksh
0,5,10,15,20,25,30 8 * * * /your/job/foo.ksh