A bungee jumper who is about to jump has her energy stored entirely as gravitational potential energy. After jumping, she bounces up and down on
the elastio bungee cord. What has happened to her initial gravitational
potential energy after she has completed one period of this motion - that is,
after she has gone down and come back up one time?

it will get slower and eventually she will stop jumping because there isnt enough force on the gravity causing her to go up and down

Explanation:

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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