A pool is 19 m long, 12m wide, and 2.7 m in depth, how many cubic meters of water will it hold ? Also how many kilometers will it hold
19m*12m*2.7m = 615.6 m^3
km are length, not volume. And why would one be interested in km^3 for a dinky swimming pool?
At any rate, just recall that 1km = 1000m