Below is an instruction that describes a task. Write a response that appropriately completes the request in Swahili. Please answer in Swahili.

### Instruction:
In four years, Peter will be twice as old as Harriet. If Peter's age is currently half of his mother's age, who is 60, how old is Harriet now?

### Response:
 Ikiwa umri wa Peter kwa sasa ni nusu ya umri wa mama yake, ambaye ana miaka 60, Peter ana miaka 1/2*60 = <<30=30>>30.
Baada ya miaka minne, Peter atakuwa na miaka 30+4 = <<30+4=34>>34.
Kwa kuwa umri wa Peter baada ya miaka minne utakuwa mara mbili ya umri wa Harriet, Harriet atakuwa na miaka 34/2 = <<34/2=17>>17 baada ya miaka minne.
Kwa sasa, Harriet ana miaka 17-4 = <<17-4=13>>13.