Doubt : Escalator problem

According to Suresh solution :
Steps = 26 but speed of escalator cannot be (26-9) / 42.5 = 0.4
because Escalator always keep moving upwards...So if u r subtracting the number of steps the man climbed i.e 9 from 26, then you should also subtract the time taken by that man in climbing those steps from 42.5 secs
LEt the time taken by that man is t secs for climbing 9 steps
then speed of escalator will be (26 - 9) / (42.5 - t).

Yes..Smart coder. The speed of escalator equation is not correct. But the answer is correct. Here is the correct equation.

(26 - 18) / 20 = 0.4

I saw this puzzle in somewhere place.. I want to change the numbers in that puzzle....In that confusion i made these mistakes...

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suresh