Algebra problem equation

[Morgyn]

An express train takes 5 1/2 hours to travel between two cities. If the express train takes only 3/5 of the time an ordinary train takes, how long will it take for the ordinary train to travel between the two towns?

I need to show all workings out.
I cant seem to break down the problem to formulate an equation and solve.

Please help.

 

[Morgyn]

Can I ask why 'S'? Why did you use that letter?

 

[Deleted member 4993]

Can I ask why 'S'? Why did you use that letter?

Do you understand - what does "S" stand for, in the equation that Denis provided?

S = The time it will take for the ordinary train to travel between the two towns

 

[Morgyn]

Thank you so so so so so much!!!!

Thank you so much for your help, you really did help me understand and I managed to work out the problem myself. It was very appreciated!!!!!!

As Subhotosh told you:
S = The time it will take for the ordinary train to travel between the two towns

So I could have shown as:
3/5 * (The time it will take for the ordinary train to travel between the two towns ) = 5.5

EASIER to use a letter; I picked S; could be any letter; capish?