Seaweed is found under an $80 \mathrm{m}$ deep seafloor. To reach it a diver makes a $45°$ dive from a boat.By the time the diver collected seaweed, the boat shifted $20 \mathrm{m}$ on the opposite side. The diver now has to rise at an angle of $60°$ to reach the boat.
What is the distance the diver travels to reach the boat?

At the toll plaza, a traffic monitoring camera is also installed at a height of $6.2 \mathrm{m}$. It takes pictures of moving vehicles at regular intervals.

The diagram below shows the position of the camera and a car moving away from it after paying the toll in four instances. The speed of the car is $5 \mathrm{m}/\mathrm{s}.$

The angle made by the camera to the car in instance $1$ is $30°$ and changes to $60°$ in instance $4$.What is the distance moved by the car? $(\surd 3=1.73)$

From the top of a tower $h m$ high, angles of depression of two objects, which are in line with the foot of the tower are $\alpha$ and $\beta \left(\beta >\alpha \right)$. Find the distance between the two objects.