Let's assume the car's first speed (constant speed) is "x" km/h.
During the first 2 hours, the car covers a distance of 2 * x = 2x km.
In the next 3 hours, the car's speed is 4 km/h faster than the initial speed "x," so the speed is (x + 4) km/h. The distance covered during these 3 hours is 3 * (x + 4) = 3x + 12 km.
In the final 4 hours, the car's speed is 10 km/h slower than the initial speed "x," so the speed is (x - 10) km/h. The distance covered during these 4 hours is 4 * (x - 10) = 4x - 40 km.
The total distance covered by the car is 602 km. So, we can set up the equation:
Distance in first 2 hours + Distance in next 3 hours + Distance in final 4 hours = Total distance 2x + 3x + 12 + 4x - 40 = 602
Combine the "x" terms and constants:
9x - 28 = 602
Now, isolate "x" by moving the constant to the other side:
9x = 602 + 28 9x = 630
Finally, solve for "x" by dividing both sides by 9:
x = 630 / 9 x = 70
The first speed (constant speed) of the car is 70 km/h.