A 3.0 kg block is initially at rest on a friction-less horizontal surface. The block is pulled with a constant horizontal net force of 4.8 N. Determine:
b) the time required for the block to reach a speed of 4.2 m/s. (Show all your work for 3
marks - it helps to number your steps)

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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