Question
The angle of elevation of an aeroplane from a point on
the ground is 60°. After 15 seconds flight the elevation changes to 30°, if the aeroplane is flying at a height of 2400√3 m. find the speed of the aeroplane.Solution
Distance between two place in which angle change is D = n(cotθ₁ + cotθ₂) Distance = 2400√3 (cot30° + cot60°) = 2400√3 × √3 - 1/√3 = 2400√3 × 2/√3 = 4800 m So, distance covered by plane in 15 sec = 4800 m Speed of plane = 4800/15 = 320 m/sec.
Statement: Z > F ≥ O; Z ≤ G = P; Q > F
Conclusion: I. P > O II. Q > G
Statements: P % Q, Q & R, R $ S, S # Z
Conclusions:
I. P & R
II. R # Z
Statements:
Some Cloud is Thunder.
Only a few Thunder is Lighting.
No Lighting is Star.
Conclusion:
I. All Cloud can ...
Statements: U = R < M < Q < P; A > B > E < R < T; I < N = B > U > X
Conclusions:
I. P ≤ U
II. T > A
...Which of the following would replace @ and & respectively in the following expression such that ‘O > A’ is definitely true?
U = O > W # B ≤...
In the question, assuming the given statements to be true, find which of the conclusion (s) among given three conclusions is /are definitely true and ...
Statement: P > Q; Q ≥ W = X < Z
Conclusions: I. W < P
II. X ≤ Q
...If the expressions, ′X < C ≤ N > E ′, ′N ≥ O′ and ′W ≥ C′ are true then which of the following combinations will be definitely true?
In the question, assume the given statements to be true. Find which of the following conclusion(s) among the three conclusions is/ are definitely true ...
Statements: P # B, Q $ B, B @ J, J % F
Conclusions: I. F # B II. F @ B ...
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