Sumali sa IDNStudy.com at makakuha ng maraming kaalaman. Ang aming mga eksperto ay nagbibigay ng mabilis at eksaktong sagot upang tulungan kang maunawaan at malutas ang anumang problema.

One pipe can fill a tank in 20 minutes, while another takes 30 minutes to fill the same tank. How long would it take the two pipes together to fill the tank?

Sagot :

in 1 min  pipe A can fill 1/20 part of a tank
in 1 min pipe B can fill 1/30 part  of a tank
in 1 min working together the two pipes can fill  1/20 +1/30
part a tank, which is      5/60 =  1/12
thus they will take    12/1  =    12 mins to fill the tank