Question

for 2 hours, Lia drove at the speed of 60 mph ,and for the next 3 hours,at the speed of 50mph.What was Lia's average speed during this trip

Answer 1

$\bf \begin{array}{ccllll} hours&speed\\ \text{\textemdash\textemdash\textemdash}&\text{\textemdash\textemdash\textemdash}\\ 1&60\\ 2&60\\ 3&50\\ 4&50\\ 5&50 \end{array}\qquad \textit{average speed}\implies \cfrac{60+60+50+50+50}{5}$