Question

Henry drives 150 miles at 30 miles per hour and then another 200 miles at 50 miles per hour. What was his average speed, in miles per hour, for the entire journey, to the nearest hundredth?

• A. $38.89$
• B. $45.00$
• C. $42.33$
• D. $34.58$

Answer 1

The correct option is A $38.89$

Time $t_1=\frac{150}{30}=5$ hours

Time $t_2=\frac{200}{50}=4$ hours

Average speed $=\frac{150+200}{5+4}$ miles/hour

$=\frac{350}{9}$ miles/hour $=38.89$ miles/hour $