Roger get ls on the elevator at the 41st
floor of a skyscraper
and rides up at the
rate of 42 floors per
minute. At the same
time, Edward gets on
an elevator at the
81st floor of the
same skyscraper
and rides down at
the rate of 78 floors
per minute. If they
continue travelling at
Thoroughly rev
these rates, then at
which floor will their
paths cross?
Answers
Answered by
1
Answer:
they will meet at the first flour
Answered by
7
Given:
Velocity of Roger = 42 floors/min
Velocity of Edward = 81 floors/min
To find:
The floor number at which their paths cross
Calculation:
Initially Roger is at the 41st floor and Edward is at the 81st floor.Suppose let they meet after ‘t’ minutes.Then
=> 41+42(t) = 81-78(t)
41+42t = 81-78t
120t = 40
t = 1/3 min
Number of floors covered by Roger in 1/3 minutes = 42×(1/3)
=14
After 1/3 min Roger will be at (41+14) th floor i.e., 55 th floor
Final answer:
They will cross their paths at 55th floor
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