A 3.40-kg ball, moving to the right at a velocity of +4.99 m/s on a frictionless table, collides head-on with a stationary 8.30-kg ball. Find the final velocities of (a) the 3.40-kg ball and of (b) the 8.30-kg ball if the collision is elastic. (c) Find the magnitude and direction of the final velocity of the two balls if the collision is completely inelastic. (a)
(b)
(c)

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