Question

eesha,babu,chitra work in a handicraft factory.eesha alone takes 10 hours to complete a single product but babu and chitra working together take 4 hours, for the complete of the same product. if all of them worked together and completed 14 products,then how many hours have they worked?

Answer 1

Answer:

40 hrs

Explanation:

eesha alone takes 10 hours to complete a single product

eesha 1 hr output  = 1/10

babu and chitra working together take 4 hours, for the complete of the same product.

babu and chitra working together 1 hr output = 1/4

All of three working together 1 hr output  = 1/10 + 1/4   =   7/20

7/20  products are completed  in  1 hr

1 product is completed in 1/(7/20) = 20/7 hr

14 products will be completed in = 14 * 20/7  = 40 hrs