 
 <prompt> 4 daliban suka samu damar buga 200m. Idan wata daliba ta samu lokacin kammala daga cikin dalibai uku ya fi 35 seconds, da lokacin kammala daga cikin dalibai hudu ya fi 30 seconds, yaya lokacin (a seconds) ya samu dalibai wanda ya buga farko damar kammala? <response>: ```Mutanen uku da aka fara ya kasance da lokacin kammala na 35 seconds don haka jama'a na kammala sun kasance 3*35 = 105 seconds
Duk mutanen uku (yana kuma jama'a da mutanen da suka gabatar) sun kasance da lokacin kammala na 30 seconds, don haka jama'a sun kasance 4*30 = 120 seconds
Mutanen da aka fara ya kasance ya tafi 120-105 = 15 seconds a haidar``` 