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JEE Main 2014 (12 Apr, Shift 1) · Relative Velocity

Relative Velocity question from JEE Main 2014 (12 Apr, Shift 1)

Q11JEE Main 2014 · 12 APR · SHIFT 1Medium

Relative Velocity

A Person climbs up a stalled escalator in 60 s. If standing on the same but escalator running with constant velocity he takes 40 s. How much time is taken by the person to walk up the moving escalator?

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Answer: (c)

  1. Speeds add: t=t1t2t1+t2t = \frac{t_1t_2}{t_1 + t_2}
  2. t=60×4060+40=24 st = \frac{60 \times 40}{60 + 40} = 24\text{ s}
  3. So the answer is (c) 24 s.
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