Question 20709
Convert into minutes 6h40 = 400min
3h = 180min
Let the unknown be x
x+(x-180)=400
2x-180=400
2x-180+180=400+180
2x=580
{{{2x/2=580/2}}}
x=290, 290-180=110
Hence one pipe fills a reservoir in 290min while the other fills it in 110min