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Answer: Check attached image
Step-by-step explanation:
The biggest thing to remember for this question:
If a negative exponent is in the denominator, move the expression to the numerator and make the exponent positive
<u>Answer: </u>
clerk A and clerk B can simultaneously stock a shelf in minutes
<u>Explanation:</u>
Let the first clerk be A and the second clerk be B
A can stock a shelf in 20 min
B can stock a shelf in 45 min
Consider the complete work to be W
A’s rate of stocking = per minute
B’s rate of stocking = per minute
When, A and B work simultaneously, rate of work done =
Total work done simulatenously =
=
Therefore, clerk A and clerk B can simultaneously stock a shelf in minutes