Question 888484
1 3/11 sq ft of the ceiling in 1 hour 31 minutes.

{{{(1+3/11)/( 1 hour 31 minutes)}}}
{{{(11/11+3/11)/( 1 + 31/60 )}}}
{{{(14/11)/(1 + 31/60 )}}}
{{{(14/11)/(60/60 + 31/60)}}}
{{{(14/11)/(91/60)}}}
approximately 1.2727/1.5167 = 0.8391 sq ft per hour