3. Rita and Neha can do certain work
individually in 20 hours and 25 hours,
respectively. How much time will it take,
if they work together to complete the
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5
Answer:
100/9 hours
Step-by-step explanation:
Suppose total work is 1 unit.
If rita does this 1 unit work in 20 hours, then rita's one hour work is 1/20 units
If neha does this 1 unit work in 25 hours, then neha's one hour work is 1/25 units
Total one hour work of rita and neha together would be (1/20) + (1/25) =9/100 units
Hence, they would together do this 1 unit work in 1/ (9/100) hours, which finally becomes 100/9 hours. Or 11 whole 1/9 hours
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