Chelsi was crossing a bridge constructed on a river. While standing on the bridge, she saw 2 boats Liberty and Columbus cross from the opposite side of the river. She could see liberty at an angle of depression of 60° and Columbus at 45°.Chelsi’ s height is 168cm and the height of the bridge from the ground is 170 m from the ground. Two people riding the boats saw the opposite edge of the bridge at an angle of 45. Find the distance between the 2 boats and also the distance to cover by the two boats to reach exactly below the bridge where Chelsi is standing.

The diagram should be clear to u....Let AD be the total height from the ground including. Chelsi s height ........... AD =171.68m...............A triangle ACD is formed on the side of liberty where angle of depression is 60°. ....... Therefore angle ACD is also 60°.. . By applying tan60 we get CD the distance between boat and exact point at the ground below chelsi...........CD= 171/√3M................ In the same way on colombus side applying tan 45 we get the distance DE in Triangle. ADE which is 171 m......................... By adding them we get distance between 2 boats that is 171.68/√3+ 171.68m. = 171.68(1/√3+1)m...........