Question

92. A can do a piece of work in 10 hours, while B can do the same work in 6 hours. B worked at it for 4 hours. How long will A take to finish the remaining work?

(a) 3 hours (b) 3 hours 20 minutes
(c) 3 hours 50 minutes (d) 5 hours​

Answer 1

Step-by-step explanation:

A's 1 hour's work =

4

1

(B+C)'s 1 hour's work =

3

1

(A+C)'s 1 hour's work =

2

1

∴C's 1 hour's work =

2

1

−

4

1

=

4

1

B's 1 hour's work =

3

1

−

4

1

=

12

1

Hence, B will complete the whole work in 12 days.