Answer:
Pablo drove the greatest distance of 527 miles.
Missing Content:
Since information on Pablo is not given, it is impossible to solve this problem. Let us assume some scenario for Pablo. Say:
(3)Pablo averaged 52.7 miles per hour and drove for 10 hours.
Step-by-step explanation:
Using this information, we can find out the data on Al,
Al drove 1 hour longer than Pablo so,
Time Al drove= 10+1 =11 hours
Average rate of Al=Pablo's average rate-5= 52.7-5 = 47.7 miles per hour.
We know that,
Average Speed = 
Distance =Average Speed x Time
Distance travelled by Al = 47.7 x 11 =524.7 miles
Distance Travelled by Marsha = 50 x 9=450 miles
Distance Travelled by Pablo= 52.7 x 10= 527 miles
<u>As we can see that Pablo drove the greatest distance which is 527 miles.</u>