Question

A and B can work separately and can develop question in 12 and 15 days respectively if they work alter natively on the questions and a being question development then in how many days will the work be completed​

Answer 1

Step-by-step explanation:

alternatively (A+B)'s consecutive two day's work=1/12+1/15=3/20

after 12 days

3/20*6=18/20

work remaining 2/20

at 13th day 2/20-1/12=1/60(work remaining)

at 14th day 1/60*15=1/4

it takes 1/4 of 14th day

so total 13 and 1/4days

work completed in 12 days = (1/12 +1/15)*6 = 6*3/20 = 18/20 work = 9/10 work

work done by A on 13 th day = 1/12

work left after 13 days = 1- 9/10 -1/12 = 1/10-1/12 = 1/60

1/60 work will be completed by B on 14 th day by taking quarter of a day.

so total 13 1/4 days.

___√\____Anushka❤