You can put this solution on YOUR website! x varies inversely as v
==> x = K/v for some constant K
given x = 45 when v = 2.
Plugging in these values in the above ,
45 = K/2
==> K = 90
So x = 90/v
When v = 10,
x = 90/v
= 90/10
= 9
So when v = 10, x = 9