A tourist can bicycle 28 miles in the same time as he can walk 8 miles. If he can ride 10 mph faster than he can walk, how much time (in hr) should he allow to walk a 25-mile trail? (Hint: How fast can he walk?) hr. (enter a fraction)

The answer is

Step-by-step explanation:

Velocity formula:

In which v is the velocity, d is the distance, and t is the time.

A tourist can bicycle 28 miles in the same time as he can walk 8 miles. He can ride 10 mph faster than he can walk:

This means that:

And

From the first equation:

So

He walks 8 miles in two hours, so:

4 miles per hour.

How much time (in hr) should he allow to walk a 25-mile trail?

This is t when . So

The answer is

correct answer:

b.(19,-2)