Question 1207036
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A train travels a certain journey and is supposed to arrive at midday. 
When its average speed is 40km/h, it arrives at 1 p.m. 
When its average speed is 48km/h, it arrives at 11 a.m. 
What is the length of the journey?
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<pre>
Let "d" be the length of the journey.


Then the travel time in the first  scenario was  {{{d/40}}}  hours.

     The travel time in the second scenario was  {{{d/48}}}  hours.


The difference between these two travel times was 2 hours (from 11 am to 1 pm).

So, we write this time equation

    {{{d/40}}} - {{{d/48}}} = 2  hours.


To solve it, multiply both sides by 240.  You will get

    6d - 5d = 2*240

       d    = 480.


<U>ANSWER</U>.  The length of the journey is 480 kilometers.
</pre>

Solved.