1.

A boat is rowed away from a cliff 150 m high. At the top of the cliff, the angle of depression of the boat changes from 60° to 45° in 2.5 minutes. The speed of the boat (in m/sec) is

Answer»

`1+1/SQRT(3)`
`1-1/sqrt(3)`
`sqrt(3) + 3`
`2sqrt(3)-3`

ANSWER :B


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