Question

A can do piece of work in 7 days of 9 hrs each and b can do it in 6 days of 7 hrs. How long will they take to do it, working together 8 hours a day

Answer 1

Answer:

Step-by-step explanation:

let A can do a unit and B can do b unit in per hour.

both A and B are doing the same work so the outcome of their work will be same .

so a * 6*9 = b * 4 *9

a : b = 2 : 3 ( it is the ratio of A and B)

if they are working together they complete the 5 units work in one hour.

and 27/5 hours they will do 5* (27/5) = 27 units

but the total work is =2*6*9 = 3 *4*9=108 units

so the days required to complete the work will be 108/27 = 4