A motor car start with speed 70kmph with its speed is increasing
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The motor car travelling at 70 km/hr will cover 70*2 = 140 km in 2 hours.
In the next 2 hours the speed is 80 km/hr. So the car covers 80*2 = 160 km in the next 2 hours. Thus the car has covered 300 km in 4 hours.
The remaining distance is 345–300 = 45 km. This distance is covered at a speed of 180 km/hr. The time taken to cover 45 km at 180 km/hr = 45/180 = 0.25 hr.
So the entire journey of 345 km is covered in 4.25 hours.
In the next 2 hours the speed is 80 km/hr. So the car covers 80*2 = 160 km in the next 2 hours. Thus the car has covered 300 km in 4 hours.
The remaining distance is 345–300 = 45 km. This distance is covered at a speed of 180 km/hr. The time taken to cover 45 km at 180 km/hr = 45/180 = 0.25 hr.
So the entire journey of 345 km is covered in 4.25 hours.
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