From a point on a bridge across a river the angle of depression of the banks on opposite sides of the river are 30° and 45° respectively. If the bridge is at the height of 30 m from the banks, the width of the river is
A. 30(1 + √3) m
B. 30(√3 – 1) m
C. 30√3 m
D. 60√3 m
Answer:A
From a point on a bridge across a river the angle of depression of the banks on opposite sides of the river are 30° and 45° respectively. If the bridge is at the height of 30 m from the banks, the width of the river is
A. 30(1 + √3) m B. 30(√3 – 1) m C. 30√3 m D. 60√3 m
Explanation: The bridge is at a height of 30 m from the banks.