D = 40.5 g / 15.0 mL<span>d = 2.70 g/mL</span>
Radial acceleration is given by

where

then

Now

Using the relation


Putting into rpm
The rule to get the average speed is as follows:
average speed = average distance / average time
We are given that:
distance = 250 m
time = 110 sec
Substitute with the givens in the above equation to get the average speed as follows:
average speed = 250/110 = 25/11 meters/sec