Find the value of if and .
Worker can make a trinket in 4 hours, Worker can make a trinket in 2 hours. When they work together, how long will it take them to make a trinket?
if 
and 
.
can make a trinket in 4 hours, Worker 
can make a trinket in 2 hours. When they work together, how long will it take them to make a trinket?