If p³ – q³ = (p-q)[(p-q)²+xpq)] then the value of x is

Two train 120 meters and 160 meters in length are running towards each other on parallel lines at the speed of 70 kmph and 42 kmph respectively. How long will it take to cross each other after they meet?

The average age of five girls is 11. The oldest among them is 15 years old. What is the average age of the others?

A number when divided by 5 leaves a remainder 3. What is the remainder when the square of the same number is divided by 5 ? 

What can be the maximum number of common tangent, which can be drawn to two non-intersecting circles? 

If tanx = cot(50+3x), then what is the value of x ?

A shopkeeper bought 25 kg. of pulses at the rate of Rs. 54 kg. He sold forty percent of the total quantity at the rate of Rs. 50 per kg. at what price per kg should he sell the approximately quantity to make 25% overall profit ?

A cycle seller gives 10% discount on marked retail price and still earns 26% profit. If marked retail price of the cycle is Rs. 840/- Then how much money was paid by the seller for that cycle?