past trial qstn (1 Viewer)

[absta]

A train is travelling at a constant velocity of 80 km per hour as it passes through the railway station at town.
At the same time, a second train commences its journey from rest at the railway station. The second train accelerates uniformly for 15 minutes until it reaches 100 km per hour and maintains this velocity for a futher 5 minutes.
At this time, each of the trains begins to slow down at a constant rate. They arrive at the next station at the same time.

By illustrating graphically the relationship between velocity and time, calculate the time taken fo the trains to travel between the two stations

 

[Dreamerish*~]

That's the exact question Airness asked me.

 

[word.]

Is the answer 37.5 minutes?

Edit: Can someone explain to my why the times on my posts are 10 minutes late?

 

[absta]

dont have the answer or working out...how did you get that?

 

[word.]

File attached.

 

[absta]

lovely, thanks so much
but you made a tiny silly mistake when calculating the triangle area..

 

[word.]

yeah i forgot to multiply the last terms on both sides of the equal signs by 1/2
can't be bothered fixing it

 

[insert-username]

Edit: Can someone explain to my why the times on my posts are 10 minutes late?

Probably because the time on the server hosting the boards is ten minutes out. That's the first thing that comes to mind, anyway.

EDIT: Yep, my post's timestamp is ten minutes slow. I think the clock on the server's a bit behind.


I_F