An aeroplane flying horiontally 1 km abo...

An aeroplane flying horiontally 1 km above the ground is observed at an elevation of `60^@` and after 10 seconds the elevation is observed to be `30^@`. The uniform speed of the aeroplane in km/h is

240

`240sqrt2`

`240sqrt3`

None of these

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An aeroplane flying horizontally at a height of 3 Km. above the ground is observed at a certain point on earth to subtend an angle of 60^@ . After 15 sec flight, its angle of elevation is changed to 30^@ . The speed of the aeroplane (taking sqrt3 = 1.732) is- कोई वायुयान पृथ्वी की सतह से 3 कि.मी. ऊपर क्षेतिज उड़ रहा है। पृथ्वी से किसी बिन्दु से यह देखने में आता है कि वह 60^@ के कोण पर कक्षांतरित होता है। 15 सेकण्ड बाद उसका उन्नयन कोण 30^@ परिवर्तित हो जाता हैं वायुयान की चाल बताइए। ( sqrt3 =1.732)

An airplane fling at constant speed parallel to the ground sqrt(3) km above. It is observe with angle of elevation 60^(0) from a point on the ground. After 5 seconds is elevation is 30^(0) then speed of aeroplane in km/hr is

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