saswata4s wrote:
Mary and Jane working together can complete a task in 2 hours and 24 minutes. Jane and Karen working together can complete the same task in 1 hour 20 minutes whereas Karen and Mary working together can complete the task in 1 hour 30 minutes. Which of the following best represents the time taken to complete the task if Mary, Jane and Karen work together?
A. 42 minutes
B. 48 minutes
C. 54 minutes
D. 1 hour
E. 1 hour 6 minutes
Another way: add rates in hours.
Express time in fractions of hours.
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