Depth = 3.5m
width = 28m
we have need to find out its area..because we directly can't findout its volume.
= 3.5 * 28 = 98 sq. m
flow of water in 10 minutes = area * velocity in minutes * time
98 * 2.4 * 1000(to convert it into metre) / 60 (to convert it into minutes) *10 = 39200 cubic mtr