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

### Instruction:
Jennie drives to her son’s house in 5 hours when there is heavy traffic. When there is no traffic the same trip takes only 4 hours. If her son's house is 200 miles away, what is the difference between her average speed when there is heavy traffic and when there is no traffic?

### Response:
 Jennie anaweza kusafiri umbali wa maili 200 kwa saa 5 wakati kuna foleni nzito, hivyo kasi yake ya wastani ni 200/5 = <<200/5=40>>40mph
Anaweza kusafiri umbali huo huo kwa saa 4 wakati hakuna foleni kwa kasi ya wastani ya 200/4 = <<200/4=50>>50mph
Tofauti ya kasi ya wastani kati ya hali hizo mbili ni (50-40)mph = <<(50-40)=10>>10mph