Answer:
f:h = 1 : 10
Step-by-step explanation:
[tex]\frac{f}{g}=\frac{1}{4}\\\\Cross multiply,\\\\4f = g\\\\g = 4f ------------(I)\\\\\frac{g}{h}=\frac{2}{5}\\\\\frac{4f}{h}=\frac{2}{5} from(I)\\\\\frac{f}{h}=\frac{2}{5*4}\\\\\frac{f}{h}=\frac{1}{5*2}\\\\\frac{f}{h}=\frac{1}{10}[/tex]