Un tren que se mueve con rapidez de 31 m/s hace sonar su silbato de 140 Hz. ¿Qué frecuencia y longitud de onda mide un observador de pie cerca de las vías a medida
que el tren se acerca? |

answer: a. same unit

explanation:

when jerome paddle in flowing river towards east the net speed of jerome will increase

so the net speed of jerome will be given as

now the speed of paul will be same as it is given as he is running on the ground

so

so here we can say since the speed of jerome is more so he will win the race

now as we know the distance so the time difference is given as

so jerome will reach first and the time difference will be 203.55 s or 3.4 min