Two cars travel in the same direction along a straight highway, one at a constant speed of 55 mi/h and the other at 65 mi/h.
(a) Assuming they start at the same point, how much sooner does the faster car arrive at a destination 15 mi away?

Correct: Your answer is correct.
min

(b) How far must the faster car travel before it has a 15-min lead on the slower car?

Incorrect: Your answer is incorrect.

Question

Two cars travel in the same direction along a straight highway, one at a constant speed of 55 mi/h and the other at 65 mi/h.
(a) Assuming they start at the same point, how much sooner does the faster car arrive at a destination 15 mi away?
  
Correct: Your answer is correct.
 min 

(b) How far must the faster car travel before it has a 15-min lead on the slower car? 
  
Incorrect: Your answer is incorrect.

anonymous · Answer

your idea?