Bill is planning to drive 280 km. If he were to start his trip 1 hour later than he plans, he would need to drive 10 miles/hour faster to make the trip in the same amount of time. What is the average speed at which Bill plans to drive?
1 Answer
Average speed was
Explanation:
Let
We told it would take
Therefore
...and replacing
Simplifying
multiplying by
Applying the quadratic formula (but ignoring the theoretically negative result)