 
 <prompt> Silvio na-achọ ịgba nke a na-eme n'ihu nke 4. Nkọwa nke ịgba a bụ 74.5 kilometers. Nkọwa mbu bụ 15.5 kilometers. Nkọwa abụọ na nkọwa atọ bụ 21.5 kilometers nke ọzọ. Kedu ihe ịgba bụ ịgba ahụ? <response>: ```15.5 + (2 * 21.5) = <<15.5+(2*21.5)=58.5>>58.5 km
74.5 - 58.5 = 16 kilometers
The last part of the race is 16 kilometers.

Answer is 16.``` 