Question 976812
x/16+x/12=1
12x/192+16x/192=1
28x=192
x=192/28=6.857142857142857 hours= 6 hours 51.42857142857143 minutes

check
6.857142857142857/16+6.857142857142857/12=1
0.4285714285714286+0.5714285714285714=1
1=1