There are 2 petrol stations 6 km away from each other. At the first one, 1 liter of petrol costs 21$, at the second costs 20$. The motorist parks at the first station but decides to go to the second station, refuel and go back. At least how many liters does he have to refuel to make the journey worth it?
I don't quite understand the task. All I've come up with is an equation [MATH]-12*20+20x>0[/MATH] Then x=13, doesn't seem right tho. Any ideas?
I don't quite understand the task. All I've come up with is an equation [MATH]-12*20+20x>0[/MATH] Then x=13, doesn't seem right tho. Any ideas?