Which radiation has no electric charge associated with it?
a) gamma rays
b) beta rays
c) alpha rays
d) all of these
e) none of these

Beta rays . . . No.  These are streams of negatively charged electrons.

Alpha rays . . . No.  These are streams of pairs of positively charged protons, identical to nucleii of Helium atoms.

Gamma rays (A) . . . Yes.  These are electromagnetic waves, not composed of charged particles.

e) none of the above answers are correct

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