Question

3boy or 5 girl can clean a compound in 8 hour in how many hours will 2 boy and 2 girls clean the same compound​

Answer 1

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Given that 5 girls take 8 hours to clean a compound, 2 girls will take (5/2)*8=20 hours, where the 2 girls will clean at a rate of 2/20 / hour. Combining them, the rate which they will clean at is = (1/6 + 1/10) = 4/15 / hour. Total time required = 1/(4/15) = 3.75 hours.

Answer 2

Step-by-step explanation:

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Given that 5 girls take 8 hours to clean a compound,

2 girls will take (5/2)*8=20 hours

where the 2 girls will clean at a rate of 2/20 / hour.

Combining them, the rate which they will clean at is

= (1/6 + 1/10) = 4/15 / hour.

Total time required = 1/(4/15)

= 3.75 hours.