Problema Solution
Carlo drove for 3 hours in fog and then increased his speed by 30 miles per hour and drove 6 more hours. If his total trip was 540 miles, then what was his speed in the fog?
Answer provided by our tutors
First, lets write some equations from the given information using the general equation D=RT (distance=rate*time):
In Fog:
D=(R)(3)
After increased speed:
540-D=(R+30)(6)
Using Algebrator to solve for 'R' and 'D', we get:
D=120 miles
R=40 mph
Therefore, his speed in the fog was 40mph