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Alice and Bert start running around a track, in opposite directions. Alice runs 3 meters per second faster than Bert. They meet after 30 seconds, and Alice completes her lap in another 20 seconds. How many seconds does it take Bert to complete one full lap of the track?

 Apr 9, 2021
 #1
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When they meet, they have covered one full lap of the track together

  they meet at 30 seconds, then

  alice takes 20 more seconds  for a total of 50 seconds per lap

  alice has covered 3/5    and  bert has only covered 2/5  of a lap

   

 

2/5 x = 30 seconds

x = 75 sec for bert -lap

 Apr 9, 2021
 #2
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thank you!

 Apr 9, 2021
 #3
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You are welcome !

ElectricPavlov  Apr 9, 2021

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