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

### Instruction:
A plane flies between 4 cities; A, B, C and D. Passengers board and alight at each airport in every city when it departs and lands, respectively.  The distance between city A and city B is 100 miles.  The distance between city B and city C is 50 miles more than the distance between city A and city B.  The distance between city C and city D is twice the distance between city B and city C. Calculate the total distance between city A and city D.

### Response:
 Kwa kuwa umbali kati ya mji A na B ni maili 100, na kati ya B na C ni 50 zaidi ya umbali kati ya A na B, basi umbali kati ya B na C ni 100+50 = <<100+50=150>>150 maili.
Umbali wa jumla wa ndege kati ya miji A na C ni 100+150 = <<100+150=250>>250 maili.
Umbali kati ya mji C na mji D ni mara mbili ya umbali kati ya mji B na mji C, ambayo ni 2*150 = <<2*150=300>>300 maili.
Ndege inaruka umbali wa 250+300 = <<250+300=550>>550 maili kati ya miji A na D.