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

### Instruction:
James spends 40 years teaching.  His partner has been teaching for 10 years less.  How long is their combined experience?

### Response:
 Mshirika wake amekuwa akifundisha kwa miaka 40-10=<<40-10=30>>30
Hivyo, uzoefu wao wa pamoja ni miaka 30+40=<<30+40=70>>70