- A15.6
- B32.5
- C13
- D18
Step-by-Step Solution
Combined rate = 1/26 + 1/39 = 3/78 + 2/78 = 5/78 per hour, so time = 78/5 = 15.6 hours.
Answer: A) 15.6
Leela can key in a long report in 26 hours, and Manoj can do the same job in 39 hours. Typing together, how many hours will they need?
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