On a family vacation you traveled 1200 miles. your total travel time was 30 hours. what was your average speed

To find the speed, you're going to find the miles per hour. So, you divide the total amount of miles traveled by the time it took to travel those miles.

1200/30

Now you have a fraction. But, this fraction can be reduced, so now we have to reduce it. Both the denominator and the numerator can be divided by 30.

40/1

So, your answer is forty miles per hour.

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood.