On the application of fraction in Mathematics It is known that the new method can complete the task that the common method can complete in 2 hours. If the two methods are used independently, how many hours can they complete the task?
Let's use the ordinary method to complete x every hour,
Because the new method work 2 hours can complete the common method work 4 hours
So with the new method, we can do 2x per hour
So x * 6 + 2x * 2 = 1 / 2
So x = 1 / 20
That is, it can be completed by working alone for 20 hours in the ordinary way
It can be completed by working alone for 10 hours with the new method