tolong ya...17,18,19

17. 25 ha-23 are-1240 m
(25×10000)-(23×100)-1240 m2
250000-2300-1240=21460 m2
19. waktu=2 1/2 jam=2 1/2×60=150 menit
v=debit×waktu=40 liter/menit×150 menit= 6000 liter D