Salutations!
Growth meters per second = 4.8 ×

First, you need to convert standard form into a normal number.
4.8 ×

= 4.800000000
a) In one day there are 24 hours, therefore you will multiplying 4.800000000 and 24
4.800000000 × 24 = 115.2 = 115.2 ×

(standard form)
b) 365 days in a year, so multiply 4.800000000 and 365
4.800000000 × 365 = 1752 = 1.7 ×

(standard form)
Hope I helped (:
have a great day!