Question 411140
you use this equation 1/a+1/b= 1/t   so you will have 1/3+1/6=1/t
                                          3 6 t
you need to find the LCD of 3&6 3*2=6
now it becomes 2t+1t=6 == 3t=6 divide both numbers by 3 3t/3t=t 6/3=2
so t=2   it would take them 2 hours working together