Discussion
David gets on the elevator at the 11th floor of a building and rides up at the rate of 57 floors per minute. At the same time, Albert gets on an elevator at the 51st floor of the same building and rides down at the rate of 63 floors per minute. If they continue travelling at these rates, then at which floor will their paths cross ?
Answer: C
Suppose their paths cross after x minutes.
Then, \(11 + 57x = 51 - 63x \Leftrightarrow 120x = 40\)
\(x = \dfrac 13\)
Number of floors covered by David in \(\left( \dfrac 13 \right )\) min.
\(= \left( \dfrac {1}{3} \times57 \right )=19\)
So, their paths cross at \((11 +19)\) i.e., 30th floor.
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