In order for heat to transfer from one object to another, which must be true?
a. the objects must be different temperatures.
b. the objects must be different sizes.
c. the objects must be the same temperature.
d. the objects must be the same size.

In order for heat to transfer from one object to another, the objects must be at different temperatures. (a)

the answer is b

explanation:

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