A car going at 10 miles per hour set out on an 80-mile trip at 9:00 A.M. Exactly 10 minutes later, a second car left from the same place and followed the same route. How fast, in miles per hour, was the second car going if it caught up with the first car at 10:30 A.M.? Select the correct option.
A) 45 B) 20 C) 53 D) 55 E) 60
Let Car A = car that starts at 9 AM   Car 20 = car that starts at 9:10 AM   Time for which car A travels at speed of 10 m per hour = 1.5 hours   Distance travelled by Car A = 10 *1.5= 
<gadget id="calculator">10 *1.5</gadget>
<output>15</output>
15 miles   Since Car 20 catches up Car A at 10:30 , time= 80 mins = 4/3 hour   Speed of Car 20 = 15/(4/3) = 20 miles per hour   Answer 20
<result>B</result>
A car going at 10 miles per hour set out on an 80-mile trip at 9:00 A.M. Exactly 10 minutes later, a second car left from the same place and followed the same route. How fast, in miles per hour, was the second car going if it caught up with the first car at 10:30 A.M.?