Quantitative Aptitude - Arithmetic Ability Questions

Find the mean proportional between 2 and 98?

What is the value of 9991 x 10009?

Car B is twice as fast as car A. If car A covers 90 km in 2 hours, what is the speed of car B?

A person goes from point N to P and comes back. His average speed for the whole journey is 60 km/hr. If his speed while going from N to P is 40 km/hr, then what will be the speed of the person (in km/hr) while coming back from P to N?

If a - b = 3 and a2+b2=25, then the value of ab is

In a Δ ABC, DE || BC. D and E lie on AB and AC respectively. If AB = 7 cm and BD = 3cm, then find BC:DE

In the given figure, ABCD is a square, BCXYZ is a regular pentagon and ABE is an  equilateral triangle. What is the value in deg of EBZ?

The radius of the circle circumscribing the three vertices of an equilateral triangle is 12 cm. Determine the height (in cm) of the equilateral triangle