Question

what should be its answer I am not getting it

Answer 1

water flow in 1minute=10m
diameter of pipe=5mm its radius=0.25mm
it can be 25×10^-5m
now volume of water flow in 1 minute=22×10×25×10^-4×25×10^-4/7
volume of cone=1×22×0.2×0.2×24/21
now time taken =volume of cone/volume of water flow in 1minute