Question

Raj does a work in 5 days while Salim does the same work work in 2 days if they work together in how many days will they complete the work​

Answer 1

Answer:

Salim takes 8 days to finish a piece of work. Manoj takes 12 days to finish the same piece of Work. Raj works twice as fast as Salim. How many days will all three of them together take to finish the same piece of work ?

A) 2311

B) 3813

C) 3913

D) 2913

E) 2211

Correct Answer:

E) 2211

Description for Correct answer:

Salim takes to complete the work = 8 days

Manoj takes to complete the work = 12 days

Raj takes to complete the work = 82 = 4 days

Required days to complete the work by all of the together = 8x12x4(8x12)(12x4)(8x4)

= 8x12x496+48+32

= 2 211

Answer 2

Answer:

Raj does work in 5 days

so in 1 day he can do 1/5 work

Similarly Salim in 1 day can do 1/2 work

So in 1 day both can do( 1/5) + (1/2) = 7/10 work

So for full work they will take 10/7days