Answer: 235 would be the estimate
You need to implement the process of "flip-flop" and multiply which is where you flip the second fraction and multiply.

÷

⇒

×

Now you multiply across. 2×15=30 and 3×11=33
So now it is

-----------------------------------------------------------
To reduce to the lowest terms, find the GCF common factor
The GCF is 3
Divide both the numerator and denominator by 3

÷

=

Answer:
We know the workers can unpack 48 books in 2 minutes, so how many minutes for 200?