Question

. 'A' completes a work in 12 days. 'B' completes the
same work in 15 days. A started working along and
after 3 days B joined him. How many days will they
now take together to complete the remaining work?
(a) 6
(c) 5
(e) None of these
(b) 8
(d) 4​

Answer 1

Answer:

5

Step-by-step explanation:

for A = w /12

B = W/15

=w/12 ( 3+x)W/15x = w

=w/15 + x/15 =1

= 5