Question

A motorist drives 5.5km from his home to work in 35 minutes but makes the return trip in only 25 minutes. What are the average speeds and average veloceties for:

(1) each half of the round trip

(2) total trip​

Answer 1

1)

$$v_1=5.5\frac{60}{35}=9.4\frac{km}{h}\\ v_2=5.5\frac{60}{25}=13.2\frac{km}{h}\\$$

2)

$$v=2\cdot5.5\frac{60}{35+25}=11\frac{km}{h}$$

Average velocity is zero.