Question

Kevin stuffs shrimp in his job as a seafood chef. He can stuff 1,000 shrimp in 4 hours. When his sister helps him, they can stuff 1,000 shrimp in 3 hours. If Kevin gets sick, how long will it take his sister to stuff 500 shrimp?

Answer 1

EXPLANATION

Since working alone, Kevin stuffs 1000/4 = 250 shrimps/h

Then, when his sister helps him, they both stuffs 1000/3 = 333.3 shrimps/h

Therefore, the sister stuffs 333-250 = 83 shrimps/h

Now, we can compute the sister can stuff 500shrimps in 500/83 = 6 hours

In conclusion, the solution is 6 hours.