An experienced window washer can wash all the windows in mike’s house in 2 hours, while a new trainee can wash all the windows in 7 hours. how long would it take them working together? round your answer to the nearest minute if needed.

It would take 1.55 hours or 93.6 minutes for them if they work together.

Solution:

Let us assume together both can complete the work in x hours.

Experienced window washer can wash the house in 2 hours.

So, in 1 hour he will do, part of the house

Hence, in x hours he will do part of the house

Again the trainee can wash all the windows in 7 hours

So, in 1 hour he will do, part of the house

Hence, in x hours he will do part of the house

We can now say,

They can complete in 1.55 hours.

1 hour = 60 minutes

So, according to unitary method, .

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