Answer:
1.2 hours
(this is equivalent to 1 hr, 12 min; also equivalent to 72 min)
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Work Shown:
x = time it takes Sydelle to do full job on her own
y = time it takes Marques to do full job on his own
z = time it takes to do full job if both work together
In this case,
x = 2
y = 3
z = unknown
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1/x + 1/y = 1/z
1/2 + 1/3 = 1/z
3/6 + 2/6 = 1/z
5/6 = 1/z
5*z = 6*1 ... cross multiply
5z = 6
5z/5 = 6/5 ..... divide both sides by 5
z = 6/5
z = 1.2 hours is the amount of time it takes if they work together. This is assuming that one worker does not slow down the other.
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Extra info:
1.2 hours = 1 hour + 0.2 hrs
1.2 hours = 1 hour + (0.2*60 min)
1.2 hours = 1 hour + 12 min
1.2 hours = 1 hour, 12 min
1.2 hours = 60 min + 12 min
1.2 hours = 72 min