# SAT Math Multiple Choice Practice Question 323: Answer and Explanation

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**Question: 323**

**15.** Ellen takes a trip that is *y* miles long in total, where . She travels the first 15 miles at an average speed of 30 miles per hour and the rest of the trip at an average speed of 40 miles per hour. Which of the following represents the total time of the trip, in hours?

A.

B.

C.

D.

E.

**Correct Answer:** A

**Explanation:**

**A** Ellen travels the first 15 miles at 30 miles per hour. Find out how much time that takes:

The rest of the trip, which is miles long, she travels at an average speed of 40 miles per hour:

Add the two values together to find the total time: