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James and Steve Rowboat Friendship 209 Views


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Description:

PSAT 1.1 Math Narrative Walkthrough. In how many hours will James and Steve meet?

Subjects:

Transcript

00:00

Hurry And here's your shmoop du jour Brought to you

00:05

by rowboats Someone asked us if we preferred rowing with

00:08

one paddle or two And we just told them either

00:12

or Yeah James starts from 1 end of lake Not

00:17

i got a lot of water and begins rolling across

00:20

the lake at a constant rate of four miles an

00:23

hour On the other side of the lake steve starts

00:25

thirty minutes after james and rose towards james at five

00:29

miles per hour The lake is fifteen point five miles

00:32

wide In how many hours will james and steve meet

00:36

around the answer to the nearest hundredth of an hour

00:38

And here the potential answers All right Not a got

00:45

a lot of water Yeah sorry We've just been considering

00:48

possible baby names lately and that was one of them

00:52

Okay so poor james and steve they desperately want to

00:56

hang out but unfortunately there's this great big lake in

00:59

between them it's a lake so they could just walk

01:02

or drive around it But apparently they prefer to hop

01:05

into their respective rowboats and get there the hard way

01:08

on mainly to help us out with this word problem

01:10

so well more power to him We're told the speed

01:13

or rate at which each boat is travelling as well

01:17

as the total width of the lake And how much

01:19

of a late start steve got putting it all together

01:22

How do we figure out when they draw alongside one

01:26

another or uh had a head on collision depending on

01:28

their aim Okay so for each hour he rose james

01:33

goes for miles and steve goes five What we don't

01:38

know is how long it took for these two to

01:40

meet so let's call the time each person rose up

01:43

until that point x well james will have been rowing

01:47

for four x miles while steve who was dilly dallying

01:50

for thirty minutes before shoving off will have road five

01:54

times the quantity x minus point five to represent the

01:57

half hour we need to subtract from his time combined

02:01

We know they will have covered fifteen point five total

02:04

miles And all of this is assuming that neither of

02:06

them takes a detour near the hugely popular floating wendy's

02:10

Big extra fries are awesome All right now we can

02:13

just add our two fellas distances together and set them

02:16

equaled a fifteen point five So for x plus five

02:20

times the quantity x minus point five equals fifteen point

02:25

five that's the magic equation while multiplying crew about a

02:28

bit in the middle we get four x plus five

02:30

x minus two point five equals fifteen point five at

02:33

which point we can add together like terms and add

02:35

two point five to both sides tow wind up with

02:38

nine x equals eighteen while divide both sides by nine

02:41

and x equals exactly two We didn't even need a

02:44

round to the nearest hundred There's a question asked you

02:47

know a curveball trigger there Nice try buddy Uh we

02:50

weren't born yesterday Okay so yeah ideas are answer And

02:54

how do we feel about the name Hundreds one hundred 00:02:57.575 --> [endTime] similar that works well Moving on

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