mohon bantuannya no.20

waktu=volume:debit
=200 liter : 5liter / menit
=40 menit

6.20+40 menit = 7.00 (b)

V=200 liter
D=5 liter/menit
W=V:D
=200:5
=40 menit
=06.20+40 menit
=06.60
=07.00 (B)

semoga membantu :)