(b) VR of a lever is 3.​

I want brainliest plz*puppy eyes*

Explanation:

VR of a lever is 3 means effort distance of the lever is 3 times more than the effort distance of the load. Efficiency of a lever is 60% means 40% of the energy is wasted due to friction as no machine is Friction less.

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