Answer:
A and B can complete the whole work in 4 hours 63 mins.
Step-by-step explanation:
A can do 1/11 of work in 1 hour
B can do whole work in 8 hour
So, In 1 hours b can do 1/8 of work
In 1 hour, A and B together can do ( 1/11 + 1/8 ) = 19/88 of work
So, A and B can complete the whole work in 88/19 = 4 hours 63 mins