Question

A and b takes 6 hours and 9 hours respectively to conpletr a work. a work for 1 hour and then b works for two hours how much work is done in these 3 hours?how much work is still left?

Answer 1

A takes 6 hours to finish work and B take 9 hours to finish the same work

∴ A’s 1 hour’s work = 1/6

And B’s 1 hour’s work = 1/9

And B’s 2 hours work = 1/9 × 2 = 2/9

(i) Now A’s 1 hour work + B’s 2 hours work = 1/6 + 2/9

= (3 + 4)/18

= 7/18

(ii) Work left = 1 – 7/18 = (18 – 7)/18

= 11/18