Two boats are heading towards each other at constant speeds of 5 miles/hr and 25 miles/hr respectively. They begin at a distance 20 miles from each other. How far are they (in miles) one minute before they collide ?
Select the correct option
A) 1/12 B) 5/12 C) 1/6 D) 1/2 E) 1/5
The question asks: how far apart will they be 1 minute=1/60 hours before they collide?   Since the combined rate of the boats is  5+25= 
<gadget id="calculator"> 5+25</gadget>
<output>30</output>
30 mph then 1/60 hours before they collide they'll be rate*time=distance --&gt; 30*1/60=1/2 miles apart.   Answer: 1/2.
<result>D</result>
Two boats are heading towards each other at constant speeds of 5 miles/hr and 25 miles/hr respectively. They begin at a distance 20 miles from each other. How far are they (in miles) one minute before they collide ?