A car going at 20 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.?
Options.
A) 40  B) 50  C) 53  D) 55  E) 60
Let Car 40 = car that starts at 9 40M   Car B = car that starts at 9:10 40M   Time for which car 40 travels at speed of 20 m per hour = 1.5 hours   Distance travelled by Car 40 = 20 *1.5= 
<gadget id="calculator">20 *1.5</gadget>
<output>30</output>
30 miles   Since Car B catches up Car 40 at 10:30 , time= 80 mins = 4/3 hour   Speed of Car B = 30/(4/3) = 40 miles per hour   40nswer 40
<result>A</result>
A car going at 20 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.?