Answer: 2. M=30H
Explanation:
Hi, to answer this question we have to analyze the information given: 
- Speed: 30 miles per hour 
- M =miles (distance) 
- H= hours (time) 
We have to apply the next formula: 
Distance = speed x time 
Replacing with the information given: 
M= 30 x H 
In conclusion, the correct option is 2. M=30H 
Feel free to ask for more if needed or if you did not understand something.