Question

What is number 3, 4 and 5?

Answer 1

3. $\frac{30 m}{2 hr}$
Since you know that you can easily split 4 to get to 2, just split the top as well.
4.$\frac{15}{1}$
Since you could divide the top by the bottom since numbers already have a denominator of 1.
5. $\frac{160}{2} = \frac{80}{1}$ 
Then multiply by 10.
$\frac{800}{10}$
Tell me if this helps!!!