speed, distance and time

eddy2017 said:
why t = 77 hours ?
109
why hours? if 77 is the amount of miles that they are going to be apart from each other?
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Which "response" are you answering?

Study response #12 and/or #16 with a piece of paper and pencil - writing down each step so that brain gets a bit of time to immerse and digest.
 
I am asking about this;
why t = 77 hours ?
109
Why only hours as unit rates?
I am not only studying everything but also classifying each problem by categories but i need to understand the rationale behind every step, the why of everything that is done. that is my doubt,
why 77 hours? . Don't forget that what you may take for granted I struggle over.
How is 109 expressed?
I deeply thank you all for your replies and help but i am a student of math and you are the experts.
 
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But i will follow your advice and re-write everything on paper and study it. Allow m some time, please, and i will see if i make any sense of the unit rates used. THANKS!
 
#14 Suppose A and B are running side-by-side (along two parallel straight lines) in the same direction with the same speed. As time passes, would the distance between A and B keep on increasing or stay same or keep on decreasing?

Well, i don't know the answer to that. If anyone can explain, please. I know that in the problem the speed is the same, constant.
 
If i continue asking questions ids because i am studying everything you have told me, and please, allow mw to tell you when i do not understand something. if I keep these queries to myself, i am not honoring your efforts.
 
Mr Khan, you asked me to re-write everything. I am doing it.
You also asked this question of me @14

What is the speed of Mario - relative to Luigi (who is travelling in the opposite direction)

Well, according to your explanation there, adding both speeds will then give Mario's relative to Luigi's= 109 mph.
it is clearly now where the 109 comes from.
I assume that the unit rate here is mph.
 
@16

They are moving away from each other at a speed (47 + 62 = 109 mph = ) 109/60 miles/min

What I don't understand here is why miles/minutes?.
I'll await for your clarification, Mr Khan , to continue.

I am sorry but I didn't understand the following statement:

for a distance 109/60 mile they drive 1 minute

for a distance 1 mile they drive 60/109 minute


Where is the 60 coming from here?
why 1 minute?
 
Ms. Harriett, I was replying to Mr Khan first not out of unpolitness but because I wanted to say the way you presented it was easier on me. Only this question:
Why do you multiply by 60 ( minutes)?.
that is why I don't get.
Thanks for helping.
It should be because 50 minutes is an hour, but I am failing to see the connection. Of course, Mr Khan had the same thing and I didn't get that either. If you would care to explain i would appreciate it no end.
 
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eddy2017 said:
@16
They are moving away from each other at a speed (47 + 62 = 109 mph = ) 109/60 miles/min
What I don't understand here is why miles/minutes?.
I'll await for your clarification, Mr Khan , to continue.
I am sorry but I didn't understand the following statement:
for a distance 109/60 mile they drive 1 minute
for a distance 1 mile they drive 60/109 minute
Where is the 60 coming from here?
why 1 minute?
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Subhotosh Khan said:
Since Mario and Luigi is going in opposite directions (assuming straight and parallel stretch.

They are moving away from each other at a speed (47 + 62 = 109 mph = ) 109/60 miles/min

for a distance 109/60 mile they drive 1 minute

for a distance 1 mile they drive 60/109 minute

for a distance 77 miles they drive (60/109 * 77 =46220/19 = ) 42.385 = 42.4 minutes
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The "relative" speed is 109 (mph) - you dont have to use 60 - if you don't want to. In that case your answer will come out in hours - and it will be

0.706 hours.
 
There are 60 minutes, not 50 minutes as you stated above, in an hour. I assume that was a typo.

Now what method do you use to convert hours to minutes? For example how would you convert 5 hours to minutes?

BTW, it is Ms Harry as Harry_the_Cat is a female (I can only assume that the cat named Harry is a male cat)
 
Oh, I understand now!. Thanks, Mr Khan and Mr Jomo. Thank you very much. Pardon my mathematical ignorance!.
It was a typo.:)
 
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To answer Mr Jomo's question
5 hours to minutes
1h=60 minutes
5h= 60*5
300 minutes.
 
eddy2017 said:
Ms. Harriett, I was replying to Mr Khan first not out of unpolitness but because I wanted to say the way you presented it was easier on me. Only this question:
Why do you multiply by 60 ( minutes)?.
that is why I don't get.
Thanks for helping.
It should be because 50 minutes is an hour, but I am failing to see the connection. Of course, Mr Khan had the same thing and I didn't get that either. If you would care to explain i would appreciate it no end.
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As Mr Khan says, if you don't multiply by 60 your answer will be in hours. That's ok, except that the question specifically asks for the answer in minutes.
 
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