Question

A and B completed a work together in 5 days. Had
A worked at twice the speed and B at half the speed,
it would have taken them four days to complete the
job. How much time would it take for A alone to do
the work?
(a) 10 days
(b) 20 days
(c) 25 days
(d) 15 days​

Answer 1

Answer:

A and B completed a work together in 5 days. had A worked at twice the speed and B at half the speed, it would have taken them four days to complete the job. How much time would it take for A alone to do the work?

A. 10 days

B. 20 days

C. 25 days

D. 15 days

E. 24 days

Answer: Option A

Answer 2

Answer:

please mark it brainliest option a

Step-by-step explanation:

Assume work to be done 100%.

First case,

A + B = 100/5 = 20% work done per day -------- (1)

Second case,

2A + B/2= 100/4 = 25% work done per day ------ (2)

On solving equation (1) and (2), we get

A = 10 days