In $\triangle$DEF, G and H are points on side DE and DF respectively. GH is parallel to EF. If G divides DE in the ratio 1:3 and HF is 7.2 cm, find length of DF?

In $\triangle$DEF, G and H are points on side DE and DF respectively. GH is parallel to EF. If G divides DE in the ratio 1:3 and HF is 7.2 cm, find length of DF?
1). 2.4 cm
2). 4.8 cm
3). 3.6 cm
4). 9.6 cm

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