4. A 6and B take 5 hours and 9 hours respectively to co1 hour and then

1.	4. A 6and B take 5 hours and 9 hours respectively to co1 hour and then B works for two hours.(1fsbfwubwd3yrhddfwhrbujvdt(0) How much work is done in these 3 hours ?(11) How much work is still left?
Answer» Answer: 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

4. A 6and B take 5 hours and 9 hours respectively to co1 hour and then B works for two hours.(1fsbfwubwd3yrhddfwhrbujvdt(0) How much work is done in these 3 hours ?(11) How much work is still left?

Answer»

Answer:

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