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30 Nov 2004, 22:13
Kudos
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Steve is on floor 11 of an elevator and goes up at a rate of 57 floors per minute.
Jan is on floor 51 and goes down at a rate of 63 floors per minute.
At what floor will they cross each other.
Thanks!
Jan is on floor 51 and goes down at a rate of 63 floors per minute.
At what floor will they cross each other.
Thanks!
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30 Nov 2004, 22:23
Kudos
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They will meet in the 30th floor
a) relative velocity = 57+63 = 120 flrs/min
b) distance between them = 51- 11 = 40 floors
c) the 40 floors can be covered in 40/120 = 1/3 rd of a minute @120 flrs/min.
d) Distance travelled by one of the lifts (take the second one for easy numbers) in 1/3rd of a minutes = 1/3 * 63 = 21 floors.
e) Thus, 51 - 21 floors = 30th floor.
a) relative velocity = 57+63 = 120 flrs/min
b) distance between them = 51- 11 = 40 floors
c) the 40 floors can be covered in 40/120 = 1/3 rd of a minute @120 flrs/min.
d) Distance travelled by one of the lifts (take the second one for easy numbers) in 1/3rd of a minutes = 1/3 * 63 = 21 floors.
e) Thus, 51 - 21 floors = 30th floor.
