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suraj sharma

· started a discussion

· 1 Months ago

solution description (Question: 322082.0 )

how do u calculated 10/sqrt3 -1 = 10 as 13 mins 40 seconds in the end,
please elaborate

Question:

A person from the top of a hill observes a vehicle moving towards him at a uniform speed. It takes 10 minutes for the angle of depression to change from 45º to 60º. After this the time required by the vehicle to reach the bottom of the hill is –

Options:
A)

12 min 20 sec

B)

13 minute

C)

13 min 40 sec

D)

14 min 24 sec

Solution:

Ans: (c)

  

Knowledge Expert

· commented

· 1 Months ago

Dear Student,
Put in 10 / root 3 -1 , put value of root 3 = 1.732
You get , 10 / 0.732 = 13.66 minutes
1 min = 60 secs , therefore 0.66 minutes = 60 * 0.66 secs = 39.6 secs = 40sec (approx)
Therefore answer is 13 min 40 secs.

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