Question 130703

ok

Distance(d) equals Rate(r) times Time(t)or d=rt; r=d/t and t=d/r

Let r=speed of the commuter 
Then r+10=speed of the express

distance commuter travels=rt=r*3 or 3r
distance express travels=rt=(r+10)*3 or 3r+30

Now we are told that the above two distances add up to 150 mi, so:

3r+3r+30=150  Can you handle it from here???


Hope this helps---ptaylor