A new photocopier can make 72 copies in 2 min. When an older photocopier is operational, the two photocopiers together can make 72 copies in 1.5 min. How long would it take the older photocopier to make 72 copies working alone?

Question

alekos · Answer

just work out how many copies per minute for the new,   N
and h.m copies for old & new,   O+N

then subtract

anonymous · Answer

@Er.Mohd.AMIR

anonymous · Answer

i dont get it @alekos

alekos · Answer

N = 72/2 = 36 copies per minute
O+N= 72/1.5 = ? copies per minute

O=(O+N)-N = ? copies per minute

alekos · Answer

then to make 72 copies just divide this by the no. of copies/minute for O

anonymous · Answer

a little clearr?

alekos · Answer

I'll let you think about this for a few minutes