Just an optimisation. Write: r+s=d/24, r-s=d/60. Subtract from 1st equation the 2nd and get: 2s=d(1/24-1/60) = d/40, so 80s=d and d/s=80. I think, this solves much faster.

I met him at nationals. It was AMAZING.

@brianyu1104

4 жыл бұрын

no one cares

@vivianz8459

4 жыл бұрын

@@brianyu1104 That's kinda mean.

@armaanmalkani

4 жыл бұрын

ur lucky suvam

@SK-rv5jn

4 жыл бұрын

Brain Yu he was nice so I don't know about what your talking about

@user-zf8gy1yw1p

3 жыл бұрын

@@brianyu1104 shut up

MAA in fall 2021: write this down, write this down!

@EvanWei-ti9me

Ай бұрын

You are the master of art😮😮😮😮

who else thought this was gonna be tips on how to solve problems fast?

@juliannazhang2414

4 жыл бұрын

math_enthuzed me

DUDE... this guy wrote a lot of AOPS Books

haha it's not speed problem solving its speed problem solving

@jiminbang5822

3 жыл бұрын

nani

@mrscribblesyt2279

Жыл бұрын

Whaaaaa

I didn’t go there before.

I will do that when I go to nationals.

@too_many_chromosomes5876

4 жыл бұрын

Did u go to nationals

@phoenixx8597

3 жыл бұрын

gl bro

what if there are too many people on the down escalator, and either you have to wait for the people to come down, or you have to get slowed down by having to push through.

DUDE THIS GUY MADE AOPS AND WROTE LIKE 15 BOOKS!

@Gabbybriii

3 жыл бұрын

we All know that

What's the music that plays at the beginning?

Question: For nationals is it the USAMO or the something else?

@npip99

9 жыл бұрын

Ray Norris He said "When I was in 8th grade I got to go to Washington DC for national Mathcounts, it was aweeesome."

Very nice

Nice, attempt on the problem.

DO it backwards: run up the down, and run down the up

The amount of time u beat her by would depend on ur speed.

s for escalator

@Ms.Amer1cana

7 ай бұрын

well, technically yea, bc like u cant really use "e" it would be weird.

your better off just timing it because it will be faster