Question

A works twie as fast as

b.If b can complete a work in 12 days independently the number of days in which a and b together complete the total work

Answer 1

Hi there!
Here's the answer:

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Given,

A is twice as fast as B
=> Ratio of working rates of A and B = 2 : 1

So, Ratio of time taken = 1 : 2
(°•° Time and work are inversely related)


Also given,
B's 1 day work = 1/12

•°• A's 1 day work = 2× (B's 1 day work)
= (2 × (1/12)) = (1/6)

(A+B)'s 1 day work = [ (1/6) + (1/12) ] = (3/12) = (1/4)

•°•
A and B together can finish the work in 4 days


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Hope it helps