<PRE><B>Question 302548</B>
It takes a small jet plane 4 hours less time than it takes a propeller driven 
plane to travel from Glen Rock to Oakville.
 The jet plane averages 637 km/h while the propeller plane averages 273 km/h.
 How far is it from Glen Rock to Oakville?
:
Let d = distance between these two towns
:
Write a time equation, Time = dist/speed
:
Prop time = Jet time + 4 hrs
{{{d/273}}} = {{{d/637}}} + 4
Multiply by 173901(273*637) to clear the denominators, results:
637d = 273d + 4(173901)
:
637d - 273d = 695604
:
364d = 695604
d = {{{695604/364}}}
d = 1911 km between these two downs
;
:
Check solution by finding the times of each
1911/273 = 7 hrs
1911/637 = 3 hrs
-------------------
difference 4 hrs</PRE>