Haanee Hamkah of Cedar Girls' followed in second place with a timing of 13.01 seconds, while Kaitlyn Hong from Nanyang Girls' High finished third with a timing of 13.24 seconds.
This is their seventh time winning both divisions in the same year.
Elaine Quah of Raffles Girls' School and Alicia Tung of Crescent Girls' School came in second and third, each with a timing of 11:57.81 and 12:07.45 respectively.
Finishing in second place was Pebbles Lee of CHIJ Secondary (Toa Payoh), who crossed the finish line in 1:11.83. Nanyang Girls' High's Tan Rou Ann took bronze in 1:11.99.
Rounding off the podium were Singapore Sports School teammates Ismi Zakiah and Nurul Syarah as second and third placers in 26.39s and 26.51s respectively.
Haanee Bte Hamkah of Cedar Girls' clocked 27.09s to bag the silver, while another SSP athlete, Norasyiqin Bte Mohamed Wahid, claimed the bronze with 27.43s.
CHIJ Katong Convent's Apeland Keira Mingan crossed the finish line in 5:25.20 to take silver while Caylee Chua of Crescent Girls' School settled for bronze in 5:28.25.
Dunman will now face defending champions CHIJ Secondary (Toa Payoh) to fight for the overall zonal championship title on Tuesday, April 21 at 2.35 p.m at Jurong East Sports Hall.
