Question 186341
12 minutes is 1/5 of an hour.

20 minutes is 1/3 of an hour.

working together = 1/x

1/5 + 1/3 = 1/x

Our LCD =  15x

Multiply each term by the LCD to remove the fractions.

3x + 5x = 15

8x = 15

x = 15/8

x = 1_(7/8)