- A105
- B72
- C12
- D84
Step-by-Step Solution
Usha's rate = 1/30 − 1/42 = 7/210 − 5/210 = 2/210 = 1/105, so she needs 105 days.
Answer: A) 105
Working together, Tara and Usha can stitch a large order of school uniforms in 30 days. Tara alone would need 42 days. How many days would Usha need alone?
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