### Question

**A man drives to town 30 miles away at a speed of 45 mph and arrives in 40 mins. On his return, he takes 60 mins. What is his average speed for the total trip?**

A. 164

B. 156

C. 155

D. 152

**Answer:** B

**Solution:**

= (12 x 8) + (6 x 14) – (2 + 8 + 10 + 4)

= (96) + (84) – (24)

= **156**