81)

A house of height 100 metres subtends a right angle at the window of an opposite house. If the height of the window is 64 metres, then the distance between the two houses is

A)

36 m

B)

48 m

C)

60 m

D)

54 m

82)

An observer on the top of a tree finds the angle of depression of a car moving towards the tree to be 30 degrees. After 3 minutes, this angle becomes 60 degrees. After how much more time will the car reach the tree?

A)

1.5 min

B)

2 min

C)

4 min

D)

4.5 min