The relationship between charges can be described by saying,

a.) charges do not interact.
b.) negative charges attract.
c.) neutral charges repel.
d.) opposite charges attract.

The correct answer for above statement is:

d.) opposite charges attract.

Explanation:

Electric charges are of two generic types: positive and negative. Two objects that have an abundance of one type of charge exercise a force of repellency on each other when comparatively close together. Two objects that have excess opposite charges, one positively charged and the other negatively charged, bring each other when approximately near.

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