Question

two candles of equal height h at the initial moment are at a distance of a from each other. the distance b/w each candle and the nearest wall is also a.
It is experimentally determined that one of the candles burns down in time t1 and the other in time t2.

with what speeds will the shadows of the candles move along the walls if the two candles are simultaneously lighted?
analyse the case only when the shadow are on the wall.