Bunuel wrote:

An employee at a company was given the task of making a large number of copies. He spent the first 45 minutes making copies at a constant rate on copier A, but copier A broke down before the task was completed. He then spent the next 30 minutes finishing the task on copier B, which also produced copies at a constant rate. How many total minutes would the task have taken had copier A not broken down?

(1) Copier A produced twice as many copies in its first 5 minutes of operation as copier B produced in its first 15 minutes.

(2) Copier B produces 10 copies per minute.

(1) Copier A produced twice as many copies in its first 5 minutes of operation as copier B produced in its first 15 minutes.

In 5 minutes A makes = 2x copies

In 45 minutes A will makes = 18x copies

In 15 minutes B makes = x copies

In 30 minutes b will make e= 2x copies

WORK IS FINISHED

Therefore total work that was remaining when A broke down was only 2x

We know that A completed 18x work in 45 minutes

therefore we know it would have completed 2x work in (45/18 )*2 = 5 minutes

SO A would have completed the task in 45 + 5 = 50 minutes

SUFFICIENT

(2) Copier B produces 10 copies per minute.

B produced 30*10 = 300 copies

We do not know how many total copies are there to make:-

Therefore we cannot know how many copies A made:-

therefore we cannot know the rate of A.

therefore we cannot know total time that A would have taken

INSUFFICIENT

ANSWER IS A

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