When the car drove 0.3 and then 0.4 more all the way, it turned out that he traveled 12 km more than half the way.

When the car drove 0.3 and then 0.4 more all the way, it turned out that he traveled 12 km more than half the way. How many kilometers did he have to travel?

Let the whole path be x km.
The car traveled 0.3 all the way, that is:
0.3 * x = 0.3x km,
And then 0.4 of the entire path, that is:
0.4 * x = 0.4x.
In total he drove:
0.3x + 0.4x = 0.7x km.
The car traveled 12 km more than half the way.
Half the way is:
0.5 * x = 0.5x.
Let’s compose and solve the equation:
0.7x – 12 = 0.5x,
0.2x = 12,
x = 60 km,
0.7x = 0.7 * 60 = 42 km.
Answer: the car drove 42 km.