As we know that average speed is given by the ratio of total distance covered and total time of motion so we will have
![v_(avg) = (distance )/(time)](https://img.qammunity.org/2019/formulas/physics/high-school/3yuklldn7353awmysvzaq0y2c8y6a1p2nh.png)
now we have
distance covered = 40 meter
time taken by the bird = 10 minutes
now in order to find the average speed of the bird
![v_(avg) = (40)/(10)](https://img.qammunity.org/2019/formulas/physics/high-school/dvx9610na1i9qdia7pn9k0jq9ttyg7tcp0.png)
![v_(avg) = 4 meter/min](https://img.qammunity.org/2019/formulas/physics/high-school/oita1nxatzbc4sbzsgl4orwnerdau6wbgr.png)
so the average speed of the bird is 4 m/min