Question 289349
x/10+x/12=1
12x+10x=120
22x=120
11x=60
x=60/11=5 5/11 minutes
5*60/11
300/11=27 second
5 minutes and 27 seconds together
check
60/11/10=6/11 for the cold water 
60/11/12=5/11 for the hot water
6/11+5/11=1
ok