A100-kg astronaut is floating in outer space. if the astronaut throws a 2-kilogram wrench at a speed of 10 meters per second, which best describes her velocity?

Since Astronaut and wrench system is isolated in the space and there is no external force on it

So here momentum of the system will remain conserved

so here we can say

initially both are at rest

so here plug in all values

so here the astronaut will move in opposite direction and its speed will be equal to 0.20 m/s

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