Math required

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this question is worked 1 mark on my assignment so it must be simple, so I dont know if i am over complicating htis. I have tried so many diffrent ways of figuring this out and none of them are right. Please help

Suppose a multiprogramming operating syste is alloting time slices of 50 seconds. If it normally takes 8 milliseconds to position a sisk read/write head over the desired track and another 17 milliseconds for the desired data to roate around the read/write head, how much of the program's time slice can be spent waiting for a read operation from a disk to take place. If the machine is capable of executing ten instructions each microsecond, how many instructions can be executed tduring this waiting period.

8+17/500 milliseconds. so 25 seconds is used to do some stuff. so 500-25=475 millseconds to wait?????

second part: 10 instructions each microsecond. so 4750 microseconds, so 4750/10= 475 instructions??????????