Tim------------------- >3.5*10=35 sq ft per minute
Both painters (10+35)=45 sq ft per minute
let's assume a cubic unit crate----------> V1=1*1*1=1 feet3
the total surface of the cube is S1=6*(1*1)=6 sq ft
if the volume of the cube increases twice
V2=2 feet3 ------------------- > 2=x*x*x------------- >x=2^(1/3)
And the S2=6*(2^(1/3)* 2^(1/3)=9.5244 sq ft
V2/V1=9.5244/6=1.5874
Therefore
If Tim and Tom----------------------- > take 1 day----------- > to paint a crate V1
For the crate V2------------- > take 1.5874 days
assuming an 8-hour work day
0.5874*8=4.70 hr-------------- > 4 h 42 min
The answer is 1 day 4h 42 min
