Question

A and B together can complete a work in 15 days. B alone can complete the same work in 45 days. Then
A) A is twice as good workman as B
B) B is twice as good workman as A
C) A is thrice as good workman as B
D) B is thrice as good workman as A
# Please detailed explain

Answer 1

Answer:

If A and B can complete it in 15 days then their one day's work is 1/15.

If B alone can do it in 45 days then B's one day work is 1/45.

Therefore A's one day work is = Their combined 1 day's work - B's one day work =

1/15 - 1/45 = 2/45

So therefore A can do the work twice the speed that of B.

So correct option is A).

Step-by-step explanation: