One pump drains one-half of a pond in 3 hours, and then a second pump starts draining the pond. The two pumps working together finish emptying the pond in one and half hour. How long would it take the second pump to drain the pond if it had to do the job alone?

Created: 1 year ago | Updated: 1 year ago

Updated: 1 year ago

$H e r e, 1 h o u r = 60 m i n u t e s .$

$∴ 24 h o u r = 24 x 60 = 1440 m i n u t e s .$

$T h e D o l p h i n c o m e s u p a i r i n 1440 m i n u t e s = \frac{1440}{2} = 720 t i m e s$

$& T h e W h a l e c o m e s u p a i r i n 1440 m i n u t e s = \frac{1440}{5} = 288 t i m e s .$

$∴ R e q u i r e d p e r c e n t a g e = (\frac{720 - 288}{288} \times 100) = (\frac{432}{288} \times 100) % = 150 %$

1 year ago

300

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