Question

A,B and c working together can do a piece of work in 8 hours.A alone can do it in 20 hours and B alone can do it in 24 hours. In how many hours will c alone do the same work ?​

Answer 1

Answer:

30 hours

Step-by-step explanation:

total time taken to do work together =1/8

time taken by A & B together=1/20 -1/24

                                                =6+5/120

                                               = 11/120

time taken by c = total time taken to do work together - time taken by A & B together

=1/8 - 11/120

=15-11/120

=4/120

=1/30

=30 hours

therefore c alone takes 30 hours t complete the work