hi, full explanation plz

As shown, a pump transfers SAE-30 oil from tank A to tank B. The tanks have a diameter of 12 m. The initial depth of the oil in tank A is 20m, and in tank B the depth is 1m. The pump delivers a constant head of 60m. The connecting pipe has a diameter of 20cm, and the head loss due to friction in the pipe is 20V2/2g. Find the time required to transfer the oil from tank A to B (that is, the time required to fill tank B to 20m depth)