WBCS.LIVE practice question

A can do a work in 15 days and B can do the same work in 20 days. How much time will they take together to do the same work?

Solve this multiple-choice question and check the correct answer with its explanation below.

Answer options

$9 \frac{4}{7} day$
$8 \frac{4}{7} day$
$7 \frac{4}{7} day$
$10 \frac{4}{7} day$

Correct answer and explanation

Correct answer: $8 \frac{4}{7} day$