BuyFind*launch*

4th Edition

James Stewart

Publisher: Cengage Learning

ISBN: 9781337687805

Chapter 1, Problem 15P

To determine

**To find:** The average speed during the whole trip.

Expert Solution

**Solution:**

The average speed is 40 mi/h.

**Given:**

Speed during the first half distance = 30 mi/h

Speed during the second half distance = 60 min/h

**Result used:**

**Calculation:**

Let

Let

Distance traveled on each half on the trip is *d*

Therefore, the total distance is 2*d*.

From the given data the time taken for the first half trip is

Time taken for the second half trip is

Thus, the average speed is 40 mi/h.