David gets on the elevator at the 11th floor

Asked by admin @ 13/08/2021 in World Languages viewed by 259 People

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 ?

Answered by admin @ 13/08/2021

Let their paths cross after x minutes
⇒11 + 57x = 51 - 63x
⇒120x = 40
⇒x=1/3
number of floors covered by David in (1/3) min =(1/3*57)
=19
∴ their paths cross at (11 +19) that is 30th floor

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Asked by elijah67 @ 28/09/2022 in World Languages viewed by 1517 persons

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Asked by elijah67 @ 28/09/2022 in World Languages viewed by 1517 persons

David gets on the elevator at the 11th floor

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