Question 80330
THE ANSWER TO ALL THESE TYPE OF PROBLEMS ARE PRODUCT OVER SUM OR X*Y/(X+Y)
WHETHER IT IS PEOPLE WORKING, TWO WATER PIPES FILLING, RESISTERS IN PARALLEL, ETC.
YOUR CASE IS THE PRODUCT OF THE TWO TIMES 3*2=6 DIVIDED BY THE SUM (3+2)=5
3*2/(3+2)=6/5=1.2 hours when they work together.