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A train traveling at 45 mph enters a tunnel that is 1 mile long. The length of the train is 1/8 of a mile. How many minutes after the front of the train enters the tunnel does the back of the train exit the tunnel? Express your answer as a decimal to the nearest tenth.

 Jun 16, 2019
 #1
avatar+105634 
+2

The back of the train (and therefore the whole train) has to travel  1+1/8 miles = 1.125 miles

So

Speed = 45m/h

Distance=1.125miles

find time.

 

The formula is 

speed = distance / time

 

So you should be able to work it out from there.

 Jun 16, 2019
 #2
avatar+208 
0

thank you I just need that...

NoobGuest  Jun 16, 2019
 #3
avatar+208 
-1

So i got 

 

45=1.125*t.....

then simplfy

t=45/1.125...

then stuff:

t=40???????????

NoobGuest  Jun 16, 2019
 #4
avatar+105634 
+1

no

speed = distance divided by time         (not multiplied by)

Melody  Jun 16, 2019
 #5
avatar+208 
-1

awwwwwwwwww. at least you caught my mistake....

NoobGuest  Jun 16, 2019
 #6
avatar+208 
-1

TRY 2

:

45=1.125/t

45t=1.125

t=0.025???

and since its round to the nearest 10th,

????? 0?

NoobGuest  Jun 16, 2019
edited by NoobGuest  Jun 16, 2019
 #8
avatar+105634 
+1

Of course I caught your mistake.  The answer was supposed to be in minutes.

It would hardly take a train 40 minutes to go through a one mile tunnel !

YOU must learn to always do sensibleness checks!

Melody  Jun 16, 2019
edited by Melody  Jun 16, 2019
 #7
avatar+105634 
+1

That is right but what are the units?  Do you have to do a conversion?

 

How many minutes after the front of the train enters the tunnel does the back of the train exit the tunnel?

 

I am really pleased that you are interacting with me Noobguest.  You will learn much better and make a better impression that way!

 Jun 16, 2019
 #9
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0

OHHHH I RESPONDED IN hours IM A IDIOT!!!!! The question asked for minutes! that's why I got such a small answer!!!!!! ohhhhhhhhhhhhhhhhhhhh.... :P

 ok so we have 0.025 of an hour which is 1.5 minetues.... much more reasonable!~ THANK YOU MELODY

NoobGuest  Jun 16, 2019
 #10
avatar+105634 
0

You are very welcome   laugh

Melody  Jun 17, 2019
 #11
avatar+208 
-1

:P i can't believe i made such an idiotic mistake though.... :(

NoobGuest  Jun 17, 2019

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