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

### Instruction:
Polly and Gerald went for a fun afternoon riding mini race cars at the munchkin track, which is a one-quarter mile circular track. Polly managed to circle the track 12 times in one half hour, but Gerald's car was malfunctioning, and he only moved at an average speed half of what Polly did.  What speed did Gerald's car average, in miles per hour?

### Response:
 Mzunguko wa barabara ya robo maili mara 12 ungekuwa ni 12/4 = 3 maili.
Katika nusu saa, Polly alizunguka barabara ya robo maili mara 12, kwa kasi ya 3 maili kwa saa 0.5, au 3/0.5 = <<3/0.5=6>>6 maili kwa saa.
Ikiwa Gerald alisafiri kwa kasi ya nusu ya ile ya Polly, basi alisafiri kwa kasi ya 6/2 = <<6/2=3>>3 maili kwa saa.