Question
Katrina walks down an up-escalator and counts 150 steps. Priyanka walks up the same escalator and counts 75 steps. Katrina takes three times as many steps in a given time as Priyanka. How many steps are visible on the escalator?
Answer: Option D
:
D
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D
Total steps are constant. Taking speed of Katrina to Priyanka to escalator as 3:1:x
⇒150−(1503)×x=75+(751)×x⇒150−50x=75+75x⇒75=125x⇒x=35
So steps =15−1503×35=120
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