Answer:
Okays so John is going 50mph
50 is 1 hour
100 is 2 hours
150 is 3 hours
200 is 4 hours
250 is 5 hours
300 is 6 hours
350 is 7 hours
400 is 8 hours
450 is 9 hours
500 is 10 hours
550 is 11 hours
600 is 12 hours
650 is 13 hours
700 is 14 hours
750 is 15 hours
He will go 750 miles from his starting point in 15 hours
The answer is: 750 miles
I hope this helps you!