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

### Instruction:
On their way driving to Los Angeles, Benjamin and James see lots of billboard ads. Curious, Benjamin starts to count how many they see. In the first hour once he starts counting he counts 17 billboards. In the second hour once he starts counting he sees 20 billboards. In the third hour he sees 23 billboards. James asks Benjamin the average number of billboards they've seen per hour. What should Benjamin tell him?

### Response:
 Benjamin anahesabu jumla ya bili bodi 17 + 20 + 23 = <<17+20+23=60>>60 wanazoziona kwenye njia ya kwenda Los Angeles. 
Benjamin anaziona bili bodi hizo kwa jumla ya masaa 3, hivyo wastani wa idadi ya bili bodi wanazoziona kwa saa ni 60 / 3 = <<60/3=20>>20 bili bodi kwa saa. 
Benjamin anapaswa kumwambia James kwamba wastani wa idadi ya bili bodi wanazoziona kwa saa ni 20.