Given,
Aasheesh can paint his doll in = 20 minutes
Chinki can paint the same in = 25 minutes
∵ Aasheesh can paint in 1 minute \(=\frac{1}{20}\) part
Chinki can paint in 1 munute \(=\frac{1}{25}\) part
∵ They both can paint in 1 minute \(=\frac{1}{20}+\frac{1}{25}=\frac{5+4}{100}=\frac{9}{100}\) part
Work done by them in 5 minute \(={5}\times\frac{9}{100}=\frac{9}{100}\) part
Remaining work \(={1}-\frac{9}{20}=\frac{11}{20}\)part
So, Aasheesh can paint remaining doll in \(\frac{\frac{11}{20}}{\frac{1}{20}}\) = 11 minutes