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TOPIC: Division Ladder

Division Ladder 9 years 8 months ago #1

  • yienhui
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given that bus 851 leave the interchange every 17min ,bus 852 every 18min and bus 853 12min.if all the bus leave the interchange on 8am when will they meet again??



my ans is 5pm i wonder if my ans is correct and is there any easier way to work out this question.Thanks for your help :)
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Re:time 9 years 8 months ago #2

  • Chris Rogers
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Hi there,

I get a different answer. My answer gives me 612 minutes later which would be 10 hrs and 12 mins. So they will meet again at 6:12pm.

You ask if there is an easier way, but you don't say how you did it?

I used a division ladder to solve the problem.



Note: We get 612 by multiplying out all the numbers in the left most column. ie 6x2x3x17 = 612
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Re:time 9 years 8 months ago #3

  • yienhui
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hmm is there more ways???? and i did this question by listing all the number out
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