Filling the community swimming pool 🏊🏻 (Finding Procedures)

A: 40
B: 45
C: 60
D: 80
E: 120

Let the number of hoses be 'x'
Total water pumped every hour = 100 x L
Now,
We know that
40000/ 10 = 100 x
4000 = 100 x
40 = x