A boy standing on a horizontal plane finds a bird, flying at a distance of 100 m from him at an elevation of 30∘. A girl standing on the roof of a 20 m high building finds the angle of elevation of the same bird to be 45∘. Both the boy and the girl are on the opposite side of the bird. Find the distance of the bird from the girl.

How do you find the Maclaurin series for tanx?

Why is Axiom 5, in the list of Euclid’s axioms, considered a ‘universal truth’? (Note that the equation is not about the fifth postulate.)

The smallest composite number is ______.

(a) 2

(b) 4

(c) 1

(d) None of these

Find the arithmetic mean of the first ten odd natural numbers.

A boat goes 24 km upstream and 28 km downstream in 6 hours. It goes 30 km upstream and 21 km downstream in 6 hours and 30 minutes. The speed of the boat in still water is

A. 10 km/hr

B. 4 km/hr

C. 14 km/hr

D. 6 km/hr