We will have the following:
a) First, we know that light travels at 299 792 458 m/s. So:
[tex]299792458\cdot60=17987547480[/tex]So, light will travel 17987547480 meters in 60 seconds.
b) We will have the following:
[tex]9.98\cdot10^{-9}\cdot1000=9980[/tex]So, there are 9980 centiliters in 9.98*10^-9 decaliters.