# Jack enters a lift on the 25th floor, which is going up @ 56 floor/min speed. At the same time Jill enters..............

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Jack enters a lift on the 25th floor, which is going up @ 56 floor/min speed.
At the same time Jill enters another lift on the 70th floor which is going down @ 64 floor/min speed.
At what floor will they be together?

posted Jan 4

Let's stop Jack's elevator at the 25th floor and add its speed to Jill's elevator ==> 56 + 64 = 120 floors/min.
Now Jill will travel 70 - 25 floors = 45 floors @ 120 floors/min to reach Jack.
ie., 45 × 60/120 = 22.5 seconds is how long it will take for them to reach the same level {(25 + (56×22.5/60)) = 46th floor}.

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