Hello,
We must calculate the volume of water in one hour.
V=15000*PI*0.07²=230,9070600... m^3/h.
Volume of the pond=50*44*.21=462 m^3
Time=462 m^3/ 230.907... m^3/h=2,0008... h≈2 h
LCM of 15 and 60 is 60.
GCF of 15 and 60 is 15.
Lets look for square numbers in the factors of 112:-
112 = 2*2*2*2*7
2*2*28" = 16
so sqrt 112 = sqrt16 * sqrt7 = 4 sqrt7 answer
