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# Maths Homework HELP!

1. Bus A stops every 12 minutes and Bus B stops every 9 minutes on the same circuit. They stop at the same bus stop at 9:15am. When is the next time this happens? Thanks.
I'm sorry if this is easy, but I don't know how to do this... I got 9:51, but is there any better way to do it than counting up till the number matches?
2. (Original post by sweetstars)
Bus A stops every 12 minutes and Bus B stops every 9 minutes on the same circuit. They stop at the same bus stop at 9:15am. When is the next time this happens? Thanks.
I'm sorry if this is easy, but I don't know how to do this... I got 9:51, but is there any better way to do it than counting up till the number matches?
It would be the LCM of 9 and 12 which is 36 since this is the lowest number that can be obtained by both using an integer multiple. so, the time is 9:15 + 36mins ---> 9:51
3. (Original post by sweetstars)
Bus A stops every 12 minutes and Bus B stops every 9 minutes on the same circuit. They stop at the same bus stop at 9:15am. When is the next time this happens? Thanks.
I'm sorry if this is easy, but I don't know how to do this... I got 9:51, but is there any better way to do it than counting up till the number matches?
i think your answer is right bcoz u find the LCM of 9 and 12 (which is 36) and add that to the original time. This gives u 9:51
4. (Original post by 123Master321)
It would be the LCM of 9 and 12 which is 36 since this is the lowest number that can be obtained by both using an integer multiple. so, the time is 9:15 + 36mins ---> 9:51
Thank you so much! XD I was so confused as to how my LCM and HCF homework had anything to do with this word problem.
5. (Original post by DD2508)
i think your answer is right bcoz u find the LCM of 9 and 12 (which is 36) and add that to the original time. This gives u 9:51
Thank you so much! I had to use a lot of Tippex from all my thinking and mistakes I made from not knowing the answer. XD

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