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A 1.5-meter snake lives in the ceiling of a college’s Chemistry Building. One day, she decides to go outside, and slithers through a pipe at the speed of 15 centimeters per second. In 90 seconds, she slithers all the way through the pipe and her whole body is outside. How long, in meters, is the pipe? 

 Feb 9, 2020
 #1
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As the head goes in.....the tail still has 150 cm to go to enter the pipe

    then the tail has to go the length of the pipe for the snake to be clear...

 

150 cm / 15 cm/sec =  10 seconds for tail to enter

    the remaining 80 seconds are the time for the tail to travel the pipe length

 

15 cm/sec x 80 sec = 1200 cm  length of pipe.   =    12 m

 Feb 9, 2020
 #2
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The snake 's speed =15 cm/s =0.15 meters/s
in 90 seconds, she can cover =0.15 x 90 =13.5 meters
13.5 meters - 1.5 meters[her body length] =12 meters - length of the pipe.

 Feb 9, 2020

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