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Jack enters a lift on 10th floor, which is going up @53 floors/min. Same time Jill enters another lift on 370th floor...

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Jack enters a lift on the 10th floor, which is going up @ 53 floors/min speed. At the same time Jill enters another lift on the 370th floor which is going down @ 67 floors/min speed. At what floor will they be together?

posted May 3, 2018 by anonymous

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1 Answer

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We can easily calculate the answer by stopping Jills elevator and adding its speed to Jacks elevator and see after what time he will reach 370 floor.
Jack's speed + Jill's speed = 53 + 67 = 120 floors/min.
360 floors gap at 120 floors/min takes 3 minutes.
Now take that 3 minutes and multiply it with his original speed
= 53×3 = 159 floors
Since he started on the 10th floor 159 +10 = 169th floor is where he will meet Jill while she comes down.

answer May 3, 2018 by Tejas Naik



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