Answer:
let the time be "x" minutes for both
after x minutes,
the first pool will have 1660l + 30.75x
and the second pool will have 1900+ 23.25x
note: both pool Will have equal volume of water
1660+ 30.75x=1900+23.25x
30.75x-23.25x= 1900-1660
7.5x=240
x = 240/7.5
x= 40minutes