Posted by Sindy on Sunday, April 18, 2010 at 8:54pm.
Two bike riders X and Y both start at 2 pm riding towards each other from 40 km apart.
X rides at 30 km/h, Y at 20 km/h. If they meet after t hours, find when and where they meet.

Maths  Reiny, Sunday, April 18, 2010 at 9:07pm
let the distance travelled by X be x km
then the distance travelled by Y has to be 40x km
time taken by X = x/30
time taken by Y = (40x)/20
but when they meet, they both took the same time, so
x/30 = (40x)/20
take over ... 
Maths  Sindy, Sunday, April 18, 2010 at 9:12pm
Thanks!