Bus X is 12 miles ahead of Bus Y, which is traveling the same direction along the same route as Bus X. If Bus X is traveling at an average speed of 41 miles per hour and Bus Y is traveling at an average speed of 57 miles per hour, how long will it take Bus Y to overtake and drive 4 miles ahead of Bus X? Choose the correct choice from the following.
A) 2 hours
B) 1 hour
C) 2 hours 20 minutes
D) 3 hours 45 minutes
E) 5 hours
Relative speed = 57-41= 
<gadget id="calculator">57-41</gadget>
<output>16</output>
16 miles per hour   Dist required= 12+4= 
<gadget id="calculator">12+4</gadget>
<output>16</output>
16 miles   Time taken to overtake= 16/16= 
<gadget id="calculator">16/16</gadget>
<output>1</output>
1 hour. 1 hour is the answer.
<result>B</result>
Bus X is 12 miles ahead of Bus Y, which is traveling the same direction along the same route as Bus X. If Bus X is traveling at an average speed of 41 miles per hour and Bus Y is traveling at an average speed of 57 miles per hour, how long will it take Bus Y to overtake and drive 4 miles ahead of Bus X?