<span>The statement which states that the most important step for preventing cardiovascular disease is to live a healthy lifestyle is true. Cardiovascular diseases are caused majorly by unhealthy life styles such as unhealthy diets, lack of exercise, smoking, been overweight, etc.</span><span />
Lisa, an experienced shipping clerk, can fill a certain order in 9 hours. Felipe, a new clerk, needs 10 hours to do the same job. Working together, how long will it take them to fill the order?
