A bus covers a distance of first 50 km in 40 minutes, next 50 km at a speed of 2 km per minute and the next 30 km at a speed of 1.0 km per minute. What is its average speed during the entire journey?

The length of a room exceeds its breadth by 2 meters. If the length be increased by 4 meters and the breadth decreased by 2 meters, the area remains the same. Find the surface area of its walls if the height is 3 meters.

Three wheels making 60, 36 and 24 revolutions in a minute start with a certain point in their circumference downwards. Find when they will again come together in the same position.

What is the probability of getting a 'nine' or 'ten' on a single throw of two dice?

A certain amount of money invested at 10% per annum compound interest for two years became Rs. 2000. What is the initial investment?

If the height of a right circular cone is increased by 200% and the radius of the base is reduced by 50%, then the volume of the cone:

An electric appliance is priced at Rs. 600 initially. Because of market recession, price was successively reduced three times, each time by 10% of the price after the earlier reduction. What is the current price?

Below given is the table showing age-wise ownership of mobiles: Brand | Up to 1 year old | 1-2 years old | 2-3 years old | More than 3 years old LG | 15% | 45% | 40% | - SAMSUNG | 5% | 15% | 25% | 55% NOKIA | 10% | 10% | 10% | 70% SONY | 25% | 55% | 20% | - MICROMAX | 15% | 50% |…

√(188 + √(51 + √169)) = ?