The ratio of police detectives and private detectives on the island is 6 to 5. If a total of 550 detectives of both kinds live o
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Answer:
Step-by-step explanation:
Given
It takes 20 min and 30 min for a person and his friend to paint a wall individually i.e.
In 1 min they cover part and
part of wall respectively.
If the work together, 1 minute work is
Time required will be reciprocal of it