Question 291044
a:m = 5:8, m:d = 7:14 = 1:2
a:d is thus 5:8:(8x2) or 5:16

A fills 1/5 per min, B fills 1/6 per min. Together, they fill at 1/5 + 1/6
So 6 + 5 over 30 = 11/30ths per min. Time is thus 30/11 = 2 8/11 mins
Roughly 2 mins 44 secs