3 boys and 5 girls can clean the school campus in 8 hrs during cleanliness drive. In how many hours will 2 boys and 2 girls clean the campus
Answers
Answer: ,
HEY Thanks for the question. Please find your answer below:
3 boys take 8 hours.
∴ Time taken by 1 boy = 3 * 8 = 24 hours
∴ Work done by 1 boy in 1 hour = 1/24 hours
5 girls take 8 hours.
∴ Time taken by 1 girl = 5*8 = 40 hours
∴ Work done by 1 girl in 1 hour = 1/40 hours
We need to find time taken by 2 boys and 2 girls.
But first, let us find the work taken by 2 boys and 2 girls.
= (1/24 + 1/24 + 1/40 + 1/40)
= 128/960.
Therefore time taken by to do the work by 2 boys and 2 girls
= 960/128
= 7.5 hours
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