A and B can do a work in 30 days They started together but after 10 days B left the work If A did th...........

Quantitative Aptitude ( CCS) Time and work

A and B can do a work in 30 days. They started together but after 10 days B left the work. If A did the remaining work in 40 days, then find in how many days B can alone do the work?

40 days

50 days

30 days

60 days

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Explanation:

Solution:
A+B=30
let total work =30
1 day work of A+B=1
10 days – 10
remaning work =20
A did 20 work in 40 days
so 30 work is done in 60 days
A+B=30 ———– 2 (total work =60)
A =60 ———-1
B= 2-1=1 => 60/1= 60 days