4. A driver sets out on a journey. For the first half of the distance she drives at the leisurely pace of 30 mph; she drives the second half at 60 mph. What is her average speed for the trip. Solve the problem algebraically using the formula D=r*t.
This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
By continuing to use this site, you are consenting to our use of cookies.
