Problema Solution
Professor minh can complete a set of experiments in 4 hours. Her assistant can do it in 6 hours. How long will it take them to complete the experiments working together?
Answer provided by our tutors
The rate of the professor is 1/4 per hour.
The rate of the assistant is 1/6 per hour.
Let 'x' the time needed to complete the experiments together.
The together rate is 1/x per hour.
1/4 + 1/6 = 1/x
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click here to see the equation solved for x
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x = 2.4 hr
x = 2 hr 0.4*60 min
x = 2 hr 24 min
It will take them 2 hours and 24 minutes to complete the experiments together.