math
posted by sam .
tom's work is 18km away, he starts walking to work at 5:30. He walks 4km every hour. His work opens at 9:00 will he be on time?
sue leaves home and ride her bike to work at 7:30. She rides 12km every hour. When does sue overtake tom. how far have they travelled?

Tom has 3 1/2 hours to get to work.
18/4 = 4 1/2 hours
___________
What do you think the answer to Sue's problem is?
We'll be glad to check your work. 
sue takes 1 1/2 to ride to work,
okay i got that. but now when does sue overtake tony? does sue overtake it in 2hrs less than tom....
BUT HOW FAR DID THEY TRAVEL? 
Here's how I attacked this problem.
When Sue started out at 7:30 she had traveled 0 km and had 18 km to go.
By 7:30, Tom had traveled 8 km and had 10 km to go.
At 8:30, Sue had traveled 12 km.
At 8:30, Tom had also traveled 12 km. 
thank you so much sue. your the best. I think I am getting it

You're very welcome, Sam. I'm glad you understand. :)