Question

a golfer rides in a golf cart at an average speed of 3.10 meters/sec for 28.0 sec. she then gets out of the cart and starts walking at an average speed of 1.30 m/s. for how long in seconds must she walk if her average speed for the entire trip, riding and walking is 1.8m/s?

Answer 1

Use the equation
Average speed =
(total distance travelled)/time

1.8 m/s =
[(3.1 * 28.0) + 1.30 t]/(t + 28)

t is the time spent walking. Solve for it

Answer 2

0.81