8) Billy, a mountain goat, is rock climbing on his favorite slope one sunny spring morning when a rock resting on a ledge 40.0 m above falls toward him. How long does Billy have to duck and avoid injury? (Hint: What causes the rock to fall downward?)

root word, prefixes, and suffixes

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.

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