One major advantage of alternating current over direct current is that you can use alternating current with a device known as a
transformer. The reason why alternating current works in transformers but direct current does not is?

A. Only Alternating current produces magnetic fields.

B. Alternating current produces larger, constant magnetic fields.

C. Alternating current has the constant voltage needed to run through a
transformer

D. Both alternating and direct current produce magnetic fields, but only
alternating current produces changing magnetic fields.

D. Both alternating and direct current produce magnetic fields, but only

alternating current produces changing magnetic fields.

Explanation:

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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