(III) A rock is dropped from a sea cliff, and the sound of it striking the ocean is heard 3.2 s later. If the speed
of sound is 340 m/s, how high is the cliff?

double the distance = divide strength by 4

i will answer your question if you answer mine

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