Question

A can do a work in 10 days and B can do the same work in 15 days . They started doing the work together .A left 2 days before the work was finished. What time was taken to finish?
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Answer 1

Step-by-step explanation:

Let us take time taken for work to finish as x

A's one day work=1/10

B's one day work=1/15

A's 2 day work + B's x day work = 1

2×1/10+x×1/15=1

1/5+x/15=1

3+x/15=1

3x/15=1

3x=1×15

=15

x=15/3=5

Time taken to finish the work = 5