Near the end of a marathon race, the first two runners are separated by a distance of 45.6 m. the front runner has a velocity of 3.1 m/s, and the second a velocity of 4.65 m/s. how many seconds earlier will the second runner reach the finish line if the front runner is 250 m from the finish line in seconds?

17.08 s

Explanation:

Given

distance between First and second Runner is 45.6 m

speed of first runner=3.1 m/s

speed of second runner=4.65 m/s

Distance between first runner and finish line is 250 m

Second runner need to run a distance of 250+45.6=295.6 m

Time required by second runner

time required by first runner to reach finish line

Thus second runner reach the finish line 80.64-63.56=17.08 s earlier

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2