- A8.4
- B20
- C9
- D7.5
Step-by-Step Solution
Combined rate = 1/12 + 1/28 = 7/84 + 3/84 = 10/84 per hour, so time = 84/10 = 8.4 hours.
Answer: A) 8.4
Kiran can iron a pile of school uniforms in 12 hours and Lata can do it in 28 hours. Working together, how many hours will they take?
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