Which of the following statements is true? 1. All isotopes of a given element have the
same mass.
2. The atomic number of an element is the
number of protons in the nucleus of any of its
isotopes.
3. The nucleus of a neutral atom contains
an equal number of electrons and protons.
4. An ion has the same number of protons
and electrons.

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

i really dont know but i will try okay.

so i think u would just add all them up and get your answer..