SOLUTION:
Step 1 :
In the question, we are told that:
Johann has traveled 15 miles from his station on the train.
He will continue on the train at 80 miles per hour.
If he ends up traveling a total of 615 miles,
we are meant to find how much longer did it take him.
Step 2:
Let t represents the time, so that we have the following:
Solving this, we have that:
CONCLUSION:
The final answer is 7. 5 hours