It takes Mr. Been 90 seconds to walk up an escalator when it is not moving. It takes Mr. Been 60 seconds to go up, just standing when the same escalator is moving. How many seconds does it take Mr. Been to walk up the moving escalator?

As per the unitary method, it will take Mr. Bean 120 seconds to walk up the moving escalator.

We can represent this situation as follows:

Time taken to walk up the escalator when not moving = 90 seconds

Distance covered = B * 90

When the escalator is moving, Mr. Bean's effective speed while walking up will be the sum of his walking speed "B" and the speed of the escalator "E." Therefore, he will take 60 seconds to cover the same distance while just standing.

We can represent this situation as follows:

Time taken to go up the escalator while standing = 60 seconds

Distance covered = (B + E) * 60

Now, to find how long it takes Mr. Bean to walk up the moving escalator, we need to find the time it takes for him to cover the same distance as before when it was not moving.

Equating the distances covered in both cases:

B * 90 = (B + E) * 60

Now, let's solve for "E":

90B = 60B + 60E

30B = 60E

E = 30B / 60

E = 0.5B

So, the speed of the escalator "E" is 0.5 times Mr. Bean's walking speed "B."

To know more about unitary method here

brainly.com/question/28276953

#SPJ2