Data Sufficiency

Official Guide

On Monday morning a certain machine ran continuously at a uniform rate to fill a production order. At what time did it completely fill the order that morning?

1) The machine began filling the order at \(9{:}30\) a.m.
2) The machine has filled \(1/2\) of the order by \(10{:}30\) a.m. and \(5/6\) of the order by \(11{:}10\) a.m.

OA B