Answer:
7/15 part of the work
Explanation:
1/3 part of the work takes 1 hour.
The unit rate of work is 1/3 job / hour.
In 1 2/5 hours, 1 2/5 hours × 1/3 job / hour is done.
1 2/5 × 1/3 = 7/5 × 1/3 = 7/15
Answer: 7/15 part of the work
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