For second one the answer is 14
The standard form:

The slope-intercept form:

m - slope
b - y-intercept
We have m = 3 and b = -5.
Substitute:
subtract 3x from both sides
change the signs

36 divided by 3 = 12
3 goes into 36 twelve times.
Step-by-step explanation:
I hope u are asking for average speed
average speed = total distance/total time
= 225/7.5
= 30 km/h or 30 km per hour